Fix unexpected newline after super

[sionleroux]

Summary

So I know that the project has specifically pinned coffeescript 1.x in its package.json but I'm trying to use coffeescript 2.x in my project because it has other things I need (namely async/await) and the bot crashes on start, referencing this line from bot.coffee:

[stdin]:20:10: error: unexpected newline
    super
         ^.

I supposed that this keyword has now become ambiguous without brackets/parentheses but to make sure, I dug up the breaking changes list for the coffeescript 2.0.0 release and found this:

Due to a syntax clash with super with accessors, "bare" super (the keyword super without parentheses) no longer compiles to a super call forwarding all arguments.
[...] if you know that the parent function doesn't require arguments, just call super().

Source: https://coffeescript.org/#breaking-changes-super-extends

After adding the brackets the coffeelint tool no longer spits out that error and when running it it "works on my machine". Tests are still passing and also I can't it imagine it having any adverse effects on users of older versions of coffeescript because the parentheses were optional so far.

Requirements

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.

[sionleroux]

Right, so according to the test results from Travis CI my previous statement about "it works on my machine" isn't good enough because it breaks for Hubot versions < 3.x yay! 😒 🎉

TypeError: Cannot read property 'logger' of undefined

I am honestly surprised. I suppose the logger it's complaining about is this one.

[sionleroux]

Right, I've just found #565 and it's reverted, so it seems progress to coffeescript 2 is much more complex than I'd hoped.