Log Message:
www/ruby-jekyll-feed: update to 0.9.3

## 0.9.3 / 2018-02-04

  * Define path with __dir (#187)
  * Bump Ruby for Travis (#188)

### Documentation

  * Fix: Add note about using plugins instead of gems key (#197)
  * Add documentation for disabling smartify filter (#205)

### Development Fixes

  * Rubocop: Target Ruby 2.2 (#195)
  * Test feeds that have a `site.lang` (#164)
  * Test against Ruby 2.5 (#201)