.gitignore in image_optim-0.22.0 vs .gitignore in image_optim-0.22.1

@@ -3,9 +3,10 @@
 
 /doc/
 /rdoc/
 /.yardoc/
 /coverage/
+/vendor/
 
 Gemfile.lock
 Makefile
 *.o
 *.bundle