Add a test for trailing whitespace.

Conflicts:
	META.yml
Add gitignore.
Add changes.
Update the POD.
Convert Build.PL to Test::Run::Builder.
Modernise Build.PL.

Conflicts:
	META.yml
Fix warning on ".".

https://rt.cpan.org/Public/Bug/Display.html?id=86894
Add to the TODO.
Bump the version to 0.23.
Add keywords and repository-link.