Document running chroma plugin in verbose mode
Document running chroma plugin in verbose mode

For #941

ibmibmibm/beets,beetbox/beets,shamangeorge/beets,ibmibmibm/beets,beetbox/beets,jackwilsdon/beets,shamangeorge/beets,beetbox/beets,shamangeorge/beets,jackwilsdon/beets,sampsyo/beets,beetbox/beets,jackwilsdon/beets,ibmibmibm/beets,sampsyo/beets,shamangeorge/beets,sampsyo/beets,sampsyo/beets,jackwilsdon/beets,ibmibmibm/beets