.gitignore in icepick-1.1.0 vs .gitignore in icepick-1.1.1

@@ -9,9 +9,10 @@
 rdoc
 spec/reports
 test/tmp
 test/version_tmp
 tmp
+Gemfile.lock
 
 # YARD artifacts
 .yardoc
 _yardoc
 doc/