fix: change regex to support github.com:org/repo format

Hi @cliffrowley,

Found this really useful, found an issue when I installed as it wouldn't recognise my github repo, so put in a fix! Let me know what you think:

Originally the regex match would fail if it found a repo in the format github.com:org/repo, so changed the regex slightly to accept both a colon and a forward slash.

Also, "fixed" and "no_tests" are valid CircleCI statuses that happen whenever a build passes right after a fail (fixed) and when they can't find any tests (no_tests), so added those in.