aligned docker-options into the default 'dokku' listing of plugins
aligned docker-options into the default 'dokku' listing of plugins

This PR should list the default enabled docker-options plugin in the help listing. This should ease the `discovery` of the plugin.

elia/dokku,elia/dokku,alexquick/dokku,claytonbrown/dokku,progrium/dokku,jimjag/dokku,dokku/dokku,claytonbrown/dokku,dokku/dokku,progrium/dokku,progrium/dokku,dokku/dokku,elia/dokku,progrium/dokku,jimjag/dokku,elia/dokku,claytonbrown/dokku,claytonbrown/dokku,claytonbrown/dokku,elia/dokku,claytonbrown/dokku,elia/dokku,jimjag/dokku,alexquick/dokku,claytonbrown/dokku,alexquick/dokku,jimjag/dokku,elia/dokku,dokku/dokku,dokku/dokku,alexquick/dokku,alexquick/dokku,jimjag/dokku,dokku/dokku,jimjag/dokku,alexquick/dokku,dokku/dokku,elia/dokku,alexquick/dokku,progrium/dokku,claytonbrown/dokku,progrium/dokku,progrium/dokku,progrium/dokku,alexquick/dokku,jimjag/dokku,dokku/dokku,jimjag/dokku