Add a "quiet" command switch

[skrenek]

Every time I open a terminal I get a "Now using feather vXXX" message. Add a -q switch to omit this output so we can add that to our bashrc or profile files.

[ryedin]

fork and give me a pull request :)

personally I want to always be notified which version my shell is using when it starts up.

[ryedin]

oops didn't mean to close the issue, just wanted to comment...