Log Message:
www/ruby-sinatra-contrib: update to 2.0.5

### sinatra-contrib

* Add `flush` option to `content_for` \ 
[#1225](https://github.com/sinatra/sinatra/pull/1225) by Shota Iguchi

* Drop activesupport dependency from sinatra-contrib \ 
[#1448](https://github.com/sinatra/sinatra/pull/1448)

* Update `yield_content` to append default to ERB template buffer \ 
[#1500](https://github.com/sinatra/sinatra/pull/1500) by Jordan Owens