Update parser gem
Update parser gem

The version in the gemfile.lock was yanked, so to get it to build on local machines and support future development, bumped the version.

https://rubygems.org/gems/parser/versions/2.5.0.4
jtarchie/pullrequest-resource,jtarchie/github-pullrequest-resource,jtarchie/pullrequest-resource,jtarchie/github-pullrequest-resource