File names like cancelRequest(for/).md are not recognized by Jekyll

[kean]

I'm trying to feed the Markdown files generated by swift-doc to Jekyll and it is not happy about certain file names.

~> bundle exec jekyll serve
Configuration file: /Users/kean/Develop/kean.github.io/_config.yml
            Source: /Users/kean/Develop/kean.github.io
       Destination: /Users/kean/Develop/kean.github.io/_site
 Incremental build: disabled. Enable with --incremental
      Generating... 
jekyll 3.8.5 | Error:  Invalid scheme format: cancelRequest(for

The name of the file in question is cancelRequest(for/).md. It was produced for a global function.

[Lukas-Stuehrk]

This should be fixed by the changes in #258.