later version of i18n don't support lower levels of ruby

JonRowe · JonRowe · commit 98cdaa246cfb · 2015-09-07T18:22:41.000+10:00
diff --git a/Gemfile b/Gemfile
@@ -30,3 +30,5 @@ else
   gem "activemodel", version
   gem "activesupport", version
 end
+
+gem "i18n", '< 0.7.0' if RUBY_VERSION < '1.9.3'
