Update src/Develpr/Zencoder/ZencoderServiceProvider.php

error messages won't need facades as they are called by your app and will be in the proper namespace
Merge branch 'patch-2' of https://github.com/wishfoundry/zencoder into wishfoundry-patch-2
removed apparently unneeded class mapping. kept note for the moment that we can use $this->package('encoder')