activesupport 5 doesn't support ruby < 2.2.2 that are still tested in this repo

amatsuda · amatsuda · commit 1f8b16f133f1 · 2017-01-11T17:31:47.000+09:00
diff --git a/Gemfile b/Gemfile
@@ -2,3 +2,5 @@ source 'https://rubygems.org'
 
 # Specify your gem's dependencies in html-sanitizer.gemspec
 gemspec
+
+gem "activesupport", RUBY_VERSION < "2.2.2" ? "~> 4.2.0" : ">= 5"
