.gitignore in smilodon-0.3.7 vs .gitignore in smilodon-0.3.8

@@ -16,9 +16,10 @@
 # jeweler generated
 pkg
 
 # rbenv
 .rbenv-version
+.rbenv-gemsets
 
 # Have editor/IDE/OS specific files you need to ignore? Consider using a global gitignore: 
 #
 # * Create a file at ~/.gitignore
 # * Include files you want ignored