Gemfile in github-markup-3.0.3 vs Gemfile in github-markup-3.0.4

@@ -9,7 +9,7 @@
 gem "rdoc", "~>3.6"
 gem "org-ruby", "= 0.9.9"
 gem "creole", "~>0.3.6"
 gem "wikicloth", "=0.8.3"
 gem "twitter-text", "~> 1.14"
-gem "asciidoctor", "= 1.5.6.1"
+gem "asciidoctor", "~> 2.0.5"
 gem "rake"