Problems with windows shims

[bjesuiter]

Currently, the detection of windows shims is not correct.

The cli output:

λ modup codeup
INFO Running undefined
     Version: 1.1.0

INFO Trying to update cli "codeup" to version "latest"...
INFO Found: Script file for command "codeup" (a.k.a Command File): C:\Users\XCG5545\.cmder\opt\.deno\bin\codeup.CMD
InvalidData: Command Shim "C:\Users\XCG5545\.cmder\opt\.deno\bin\codeup.CMD" may not have been generated by "deno install"! 
      Force proceed by running again with --validateDenoShim=false.

      File Content:

      % generated by deno install %
@deno "run" "--allow-read" "--allow-write" "--allow-net" "--allow-env" "--allow-run" "--check" "https://deno.land/x/codeup@2.0.0-beta.4/main.ts" %*

    at parseCommandShim (https://deno.land/x/modup@1.1.0/src/features/deno-command-shim/parse-command-shim.ts:39:11)
    at Object.commandHandler [as handler] (https://deno.land/x/modup@1.1.0/src/commands/mainCommand.ts:29:23)

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