visdiff: Add VISDIFF_DRY_RUN env var for testing
visdiff: Add VISDIFF_DRY_RUN env var for testing

keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client