Update redcarpet to 3.3.3 when pushed to rubygems

• Rubygem request - https://github.com/vmg/redcarpet/issues/518
• Memory leak fix - https://github.com/vmg/redcarpet/commit/e2e26e2aec320b853282f1f8eca190560b52b0d9
• Blog post in case you interested about leak - http://www.be9.io/2015/09/21/memory-leak/

Wow, good blog post.

mentioned in merge request !1607 (merged)

Status changed to closed by commit 8b540634

Milestone changed to 8.1

mentioned in commit 8b540634