verify is_notable_action? is working

[outofambit]

i think i keep seeing my pr status get reevaluated when i make non-code changes to the pr

if there's a bug, its likely in https://github.com/carbonfive/funnel/blob/f0ab433e3d424955754e3eaed470ff4a567c616a/lib/funnel/investigator/helpers.ex#L55-57

we need to make sure that this function only returns true for "opened", "reopened", and "synchronize". and that Investigator is using that value to skip investigation when is_notable_action? returns false.

more context from the GitHub API docs: https://developer.github.com/v3/activity/events/types/#pullrequestevent