.gitignore: Ignore .ruby-version in any subdir

Author: jeremy

.gitignore

@@ -1,11 +1,11 @@
 # Don't put *.swp, *.bak, etc here; those belong in a global ~/.gitignore.
 # Check out https://help.github.com/articles/ignoring-files for how to set that up.
 
-debug.log
 .Gemfile
-/.bundle
-/.ruby-version
+.ruby-version
+debug.log
 pkg
+/.bundle
 /dist
 /doc/rdoc
 /*/doc