Prepare 2.000: GitHub-Flavored Markdown, unfiltered HTML

Bump the version to 2.000 and write the changelog for the first release off
the breaking-change line. Two changes are incompatible for existing users:
Markdown::Perl replaces Text::MultiMarkdown, so MultiMarkdown-only syntax
stops rendering, and the distribution now requires Perl 5.26 or later where
it previously declared no minimum at all.

Note in the changelog that 1.903 is the final release for older perls, that
it stays installable from CPAN, and that the 1.x line lives on maint/1.x.

Carry Jason's README revisions -- a "Before you begin" section stating the
Perl 5.26 requirement, and a "Support for Plerd 1.x" section pointing at the
maintenance branch and the 1.903 release -- from README.md back into
README.pod, and regenerate README.md from it.

Also refresh two test comments that still described the MultiMarkdown era,
and regenerate META.json and Makefile.PL.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Ku1xgyEKjWv4snx4U4njSo

Author: jmacdotorg

Changes

@@ -2,6 +2,31 @@ Revision history for Plerd
 
 {{$NEXT}}
 
+      - Plerd now processes Markdown with Markdown::Perl, running in its
+        GitHub-Flavored Markdown (GFM) mode, in place of Text::MultiMarkdown.
+        Fenced code blocks work at last -- both ``` and ~~~ fences, with a
+        fence's language becoming a "language-foo" class on its <code> element
+        -- as do GFM tables, strikethrough, and task lists, atop the whole of
+        the CommonMark spec. Syntax peculiar to MultiMarkdown is no longer
+        recognized.
+
+      - Plerd requires Perl 5.26 or later, a requirement inherited from
+        Markdown::Perl. Version 1.903 is the last release to support earlier
+        versions of Perl. It remains available from CPAN by way of "cpanm
+        Plerd@1.903", and the 1.x line continues to live on this project's
+        "maint/1.x" Git branch.
+
+      - All HTML markup found in a post's source file now passes through to
+        the published page, unfiltered. GFM ordinarily escapes tags such as
+        <iframe>, <script>, and <style>, because GitHub renders text from
+        strangers; Plerd, a single-user blogging platform, instead trusts that
+        its author meant to write the markup that they wrote.
+
+      - Markdown::Perl replaces Text::MultiMarkdown among this distribution's
+        dependencies. Capture::Tiny, which the test suite has long used while
+        receiving it by happenstance from the Text::Markdown stack, is now
+        declared outright.
+
 1.903 2026-06-26T01:15:00Z
 
       - Open Graph metadata tags are now generated for any post that has an

META.json

@@ -82,7 +82,7 @@
          "web" : "https://github.com/jmacdotorg/plerd"
       }
    },
-   "version" : "1.903_001",
+   "version" : "2.000",
    "x_authority" : "cpan:JMAC",
    "x_contributors" : [
       "Christian Sánchez <sanchezchristian@gmail.com>",

Makefile.PL

@@ -11,7 +11,7 @@ use ExtUtils::MakeMaker 6.64;
 my %WriteMakefileArgs = (
     NAME     => 'Plerd',
     DISTNAME => 'Plerd',
-    VERSION  => '1.903_001',
+    VERSION  => '2.000',
     EXE_FILES => [glob('script/*'), glob('bin/*')],
     CONFIGURE_REQUIRES => {
   "ExtUtils::MakeMaker" => "6.64"

README.md

@@ -40,13 +40,17 @@ I do my best to avoid breaking functionality when I do release updates to Plerd,
 
 ## Setup
 
-### Installation
+### Before you begin
+
+To install and run Plerd, you need the following installed on your machine:
 
-**First, make sure you have the `cpanm` program on your machine.** It is likely
-available as "cpanminus" in your favorite package manager. (Or install it from
-source, through the instructions at [http://cpanmin.us](http://cpanmin.us).)
+- Perl version 5.26 or later. [Perlbrew](https://perlbrew.pl) is an excellent tool to install and manage a more recent perl alongside your machine's system Perl, if needed.
+- The `cpanm` program for managing third-party Perl libraries. You can likely find it as `cpanminus` in your favorite package manager. Or, install it from
+source, through the instructions at [http://cpanmin.us](http://cpanmin.us).
+
+### Installation
 
-Then, to install the latest release of Plerd, run this command:
+To install the latest release of Plerd, run this command:
 
     cpanm Plerd
 
@@ -249,6 +253,12 @@ You can also [email me, Jason McIntosh](mailto:jmac@jmac.org), directly. I am al
 
 [Plerd has a homepage at its creator's website.](http://jmac.org/plerd)
 
+### Support for Plerd 1.x
+
+Plerd version 2.000 was released in July, 2026, after a significant change in dependencies required a more recent Perl version. If you still need to run Plerd version 1, you can find a maintenance branch called `maint/1.x` in the Plerd GitHub repository. You can also [find the most recent version 1 release on CPAN](https://metacpan.org/release/JMAC/Plerd-1.903), and install it directly with the following command:
+
+    cpanm Plerd@1.903
+
 ## See Plerd at work
 
 This software powers Jason McIntosh's blog, [Fogknife](http://fogknife.com), for which it was originally written.

README.pod

@@ -42,13 +42,26 @@ I do my best to avoid breaking functionality when I do release updates to Plerd,
 
 =head2 Setup
 
-=head3 Installation
+=head3 Before you begin
+
+To install and run Plerd, you need the following installed on your machine:
+
+=over
+
+=item *
+
+Perl version 5.26 or later. L<Perlbrew|https://perlbrew.pl> is an excellent tool to install and manage a more recent perl alongside your machine's system Perl, if needed.
+
+=item *
+
+The C<cpanm> program for managing third-party Perl libraries. You can likely find it as C<cpanminus> in your favorite package manager. Or, install it from
+source, through the instructions at L<http://cpanmin.us>.
+
+=back
 
-B<First, make sure you have the C<cpanm> program on your machine.> It is likely
-available as "cpanminus" in your favorite package manager. (Or install it from
-source, through the instructions at L<http://cpanmin.us>.)
+=head3 Installation
 
-Then, to install the latest release of Plerd, run this command:
+To install the latest release of Plerd, run this command:
 
  cpanm Plerd
 
@@ -346,6 +359,12 @@ You can also L<email me, Jason McIntosh|mailto:jmac@jmac.org>, directly. I am al
 
 L<Plerd has a homepage at its creator's website.|http://jmac.org/plerd>
 
+=head3 Support for Plerd 1.x
+
+Plerd version 2.000 was released in July, 2026, after a significant change in dependencies required a more recent Perl version. If you still need to run Plerd version 1, you can find a maintenance branch called C<maint/1.x> in the Plerd GitHub repository. You can also L<find the most recent version 1 release on CPAN|https://metacpan.org/release/JMAC/Plerd-1.903>, and install it directly with the following command:
+
+ cpanm Plerd@1.903
+
 =head2 See Plerd at work
 
 This software powers Jason McIntosh's blog, L<Fogknife|http://fogknife.com>, for which it was originally written.

lib/Plerd.pm

@@ -1,6 +1,6 @@
 package Plerd;
 
-our $VERSION = '1.903_001';
+our $VERSION = '2.000';
 
 use Moose;
 use MooseX::Types::URI qw(Uri);

t/basic.t

@@ -203,7 +203,7 @@ like ( $plerd->post_with_url( "http://blog.example.com/$ymd-metatags-with-image-
     'Automatically derived description works, with leading image tag present.',
 );
 
-# make sure that multimarkdown tables work
+# make sure that GFM tables work
 like ( $plerd->post_with_url( "http://blog.example.com/$ymd-markdown-table.html")->body,
     qr{<td>Pizza</td>},
     'Markdown tables are rendered.',

t/code_blocks.t

@@ -12,10 +12,9 @@ use_ok( 'Plerd' );
 use Plerd::Init;
 
 # Regression test for GitHub issue #57: GitHub-style fenced code blocks.
-# Text::MultiMarkdown does not understand ``` or ~~~ fences -- it collapsed a
-# backtick-fenced block into a single inline <code> span (so every line
-# wrapped together) and ignored ~~~ entirely. Plerd now pre-processes fences
-# into <pre><code> blocks before handing the body to Markdown.
+# Markdown::Perl's GitHub mode renders both ``` and ~~~ fences as <pre><code>
+# blocks, preserving line breaks and turning a fence's language into a
+# "language-foo" class.
 
 my $blog_dir = Path::Class::Dir->new( "$FindBin::Bin/code_blocks_blog" );
 $blog_dir->rmtree;