.gitignore in arbre-1.1.1 vs .gitignore in arbre-1.2.0.rc1

@@ -1,10 +1,10 @@
 *.gem
 .bundle
-Gemfile.lock
 pkg/*
 benchmarks
 .rvmrc
 .ruby-version
 .ruby-gemset
 tags
 .DS_Store
+docs/_site