Add GFM todo snippet
Merge pull request #11 from andytlr/add-todo-snippet

Add GFM todo snippet
Prepare 0.23.0 release
Support ```html code blocks
Prepare 0.24.0 release
Add Table Snippet
Merge pull request #13 from andytlr/add-table-snippet

Add Table Snippet
Prepare 0.25.0 release