Log Message:
www/ruby-mustermann: update to 1.0.3

Mustermann 1.0.3 (2018-08-17)

* Handle with_look_ahead on SafeRenderer. Fixes sinatra/sinatra#1409
  @namusyaka
* Fix EqualityMap#fetch to be compatible with the fallback Hash#fetch. Fixes
  #89 @eregon
* Improve code base and documentation. @sonots, @iguchi1124