Remove dzil license plugin so CI can run

Since we already have a license file, Dist::Zilla will die if it tries
to generate another. Disabling the license plugin keeps our license file
intact, allowing CI to run, and for GitHub to show a license tab to
users.

dist.ini

@@ -28,6 +28,7 @@ add_files_in = README.md
 -remove = AutoPrereqs
 -remove = GithubMeta
 -remove = ModuleBuild
+-remove = License
 
 [DynamicPrereqs]
 ; GH#1332 if old HTTP::XSCookies is installed we need to upgrade