Allow failures for ruby-head

[mbj]

Travis with rub-head is broken. We should allow failures here.

@snusnu Pls add me as collab!

[coveralls]

Coverage remained the same when pulling e78b8c3 on mbj:master into 6e181b1 on snusnu:master.

[snusnu]

@mbj thx! also, i added you as a collaborator

[dkubb]

@snusnu Id probably recommend disabling @coveralls commenting. I haven't found it adds much value. Maybe if it were possible to configure it to notify only when coverage drops.

I only like being notified by systems when something exceptional and unexpected occurs. Coverage staying the same or increasing is expected and a natural occurrence in a healthy codebase, so I don't see any need to be notified.

It's the same reason I configure travis like this:

notifications:
  irc:
    channels:
      - irc.freenode.org#rom-rb
    on_success: never
    on_failure: change
  email:
    recipients:
      - dan.kubb@gmail.com
    on_success: never
    on_failure: change

Which will not send me any notifications except the first time the build breaks.

[snusnu]

@dkubb good call! i already wanted to do that cause yeah, imo the coveralls comments are noise, and substation is already 100% mutation covered anyway, so we'll notice a drop in coverage anyway as rake ci will fail on travis.

all that said, i just disabled coveralls commenting for this repo.