.gitignore in chess-0.3.1 vs .gitignore in chess-0.3.2

@@ -1,11 +1,11 @@
 *.gem
 .bundle
+.byebug_history
 .yardoc/
-doc/
+coverage/
 ext/chess
 ext/Makefile
 ext/*.bundle
 ext/*.o
-Gemfile.lock
 main.rb
 pkg/*