Travis: enable verbosity when testing the plugin functionality
Travis: enable verbosity when testing the plugin functionality

This shows in travis that the `vm` test suite actually runs twice.

Maxwell-Alexius/goby,goby-lang/goby,st0012/Rooby,goby-lang/goby,goby-lang/goby,Maxwell-Alexius/goby,st0012/Rooby,Maxwell-Alexius/goby