fix: options behaviour in findAPortNotInUse and findAPortInUse

[alexander-akait]

@laggingreflex
Include:

1. Fix options behaviour in findAPortNotInUse and findAPortInUse
2. Improve tests and increase coverage (99.07%)
3. Update async to latest (import perf)

[alexander-akait]

@laggingreflex also i can rewrite tests using jest (in next PR), it is allow mocking and do tests more simple and stable

[laggingreflex]

Hi @evilebottnawi Extremely sorry for delay.

1. Fix options behaviour in findAPortNotInUse and findAPortInUse

I don't see findAPortNotInUse or findAPortInUse functions ever accepting an options argument. Only the checkPortStatus function does so. Although findAPortNotInUse doesn't throw when passed options it doesn't work either.

You said that it's being used this way in browser-sync, I'm not sure why they used it that way.

This could be a great feature, but I just wanna be clear on whether this is fixing a bug which is causing other projects dependent on it fail, or it's just a new feature?

---

Another thing was that I couldn't run tests. Got an error:

  √ checkPortStatus - free (with host in options argument) (401ms)
C:\...\portscanner\test.js:191
      t.is(t._expr(t._capt(t._capt(error, 'arguments/0/object').code, 'arguments/0'), {
                                                               ^

TypeError: Cannot read property 'code' of null
    at C:\...\portscanner\test.js:191:64
    at Socket.<anonymous> (C:\...\portscanner\lib\portscanner.js:132:5)
    at emitOne (events.js:125:13)
    at Socket.emit (events.js:221:7)
    at TCP._handle.close [as _onclose] (net.js:558:12)
  √ checkPortStatus - free (402ms)
TypeError: Cannot read property 'stack' of undefined
    at error (C:\...\portscanner\node_modules\ava\cli.js:51:20)
    at runCallback (timers.js:800:20)
    at tryOnImmediate (timers.js:762:5)
    at processImmediate [as _immediateCallback] (timers.js:733:5)
From previous event:
    at Object.<anonymous> (C:\...\portscanner\node_modules\ava\cli.js:216:34)
    at Module._compile (module.js:641:30)
    at Object.Module._extensions..js (module.js:652:10)
    ...

I hope this isn't just my OS (Windows). I've set up CircleCI.

---

I'm in favour of Jest.

---

Lastly, I wanna set up something like don't-break before adding any new features so please give me some time for that as well.

[alexander-akait]

/cc @laggingreflex repo are abadoned?

[laggingreflex]

I tested it on *nix and the tests are passing. I also tested against browser-sync whose tests are passing too. So this should be good to release.

Sorry about the delay again.

[laggingreflex]

Merged, 2.2.0 released.