Update core requirements for Silex 2:
Update core requirements for Silex 2:

  * silex/silex ^2.1
  * silex/web-profiler ^2.0
  * symfony components ^3.3
  * swiftmailer/swiftmailer ^6.0
  * sorien/silex-pimple-dumper:^2.0
  * bolt/thumbs dev-silex2@dev

lenvanessen/bolt,lenvanessen/bolt,nikgo/bolt,nikgo/bolt,lenvanessen/bolt,GawainLynch/bolt,GawainLynch/bolt,nikgo/bolt,lenvanessen/bolt,GawainLynch/bolt,GawainLynch/bolt,nikgo/bolt