Merge pull request #313 from intercom/elk/media_type

Use media_type instead of content_type

Author: eugeneius

lib/intercom-rails/auto_include_filter.rb

@@ -55,7 +55,11 @@ def response
       end
 
       def html_content_type?
-        response.content_type == 'text/html'
+        if response.respond_to?(:media_type)
+          response.media_type == 'text/html'
+        else
+          response.content_type == 'text/html'
+        end
       end
 
       def response_has_closing_body_tag?