Image link with a title fails to resolve the image path #60

Description

If an image link includes an optional title, mdview treats the title as part of the file path. The image then fails to load.

CommonMark allows a title after the image destination:

![Architecture diagram](images/diagram.png "Architecture diagram")

Steps to reproduce

1. Create docs/images/diagram.png.

2. Create docs/example.md with this content:

   # Example
   
   ![Architecture diagram](images/diagram.png "Architecture diagram")

3. Run mdview docs/example.md.

Expected behavior

mdview resolves the path docs/images/diagram.png and shows the image. The title becomes the image's title attribute.

Actual behavior

mdview prints a warning, and the image does not show:

Warning: Unable to stat image file /path/to/docs/images/diagram.png "Architecture diagram": stat /path/to/docs/images/diagram.png "Architecture diagram": no such file or directory

The quoted title is included in the path that mdview tries to stat.

If the title is removed (![Architecture diagram](images/diagram.png)), the image shows correctly.

Environment

• mdview 1.8.0
• macOS