rails/arel — pull request #115 by carlosantoniodasilva (2012-04-02 12:01:50+00:00)
Title: Remove lib/arel/relation from the list of files in gemspec

Commit 9978fc40a8a5a262670279129a335845ad647f48 removed deprecated relation
from arel. Here's the warning message I'm having when installing:

The validation message from Rubygems was:
["lib/arel/relation.rb"] are not files