.gitignore in image_optim-0.25.0 vs .gitignore in image_optim-0.26.0

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