Converted the 'unsupported' platform error to a warning.  The list of platforms appears to be out of date with the actual releases. You shouldn't have these platforms hard coded in the plugin because that kind of information is bound to go out of date really quickly.
Converted the 'unsupported' platform error to a warning.  The list of platforms appears to be out of date with the actual releases. You shouldn't have these platforms hard coded in the plugin because that kind of information is bound to go out of date really quickly.

entropi/grunt-electron-app-builder,speak/grunt-electron-app-builder,tommoor/grunt-electron-app-builder,vtherli/grunt-electron-app-builder