Lock rake version '~> 11.0 to fix rspec

ojab · ojab · commit 689c3fb4a5b5 · 2018-03-29T13:17:24.000Z
deprecated method 'last_comment' that is used by rspec was removed in 12.0
diff --git a/Gemfile b/Gemfile
@@ -4,4 +4,4 @@ source "http://rubygems.org"
 gemspec
 
 gem "ZenTest", "4.6.0"
-gem "rake"
+gem "rake", '~> 11.0'
