Only allow 1 message per second to slack servers

[gictor]

No description provided.

[coveralls]

Coverage remained the same at 100.0% when pulling 42e9349 on strossle:master into dc43448 on qualitybath:master.

[tikotzky]

Thanks for PR.
A couple questions...

1. Can you make this configurable? My app will send bursts of messages at more than 1 per second when errors occur and I haven't actually got rate limited in a long time.
2. Are you able to submit the actual changes needed without updating formatting? It makes it hard to review when the entire file shows changed because formatting changes..

Thanks again.

[coveralls]

Coverage remained the same at 100.0% when pulling f562632 on strossle:master into dc43448 on qualitybath:master.

[gictor]

Thanks for looking in to this @tikotzky. I think i got number 2 under control, indeed that was ugly. Concerning number one i could make it configurable if I have your word on you actually merging the pull request :).

As a side note, our issue is not the rate limit but this package crashing our applications JavaScript heap out of memory. My theory is that when things start failing, it start hogging sockets, that eats memory...

[tikotzky]

no promises but if I can turn it off and/or decrease the timeout in my app I would merge 😄

regarding crashing your app... I'm running on heroku (with not that much ram) and haven't had that happen to us even in when large amounts of errors occurred, but i guess anything is possible...

[coveralls]

Coverage decreased (-14.3%) to 85.714% when pulling b5346ef on strossle:master into dc43448 on qualitybath:master.

[coveralls]

Coverage decreased (-14.3%) to 85.714% when pulling b5346ef on strossle:master into dc43448 on qualitybath:master.

[coveralls]

Coverage decreased (-14.3%) to 85.714% when pulling fbad154 on strossle:master into dc43448 on qualitybath:master.

[coveralls]

Coverage decreased (-4.8%) to 95.238% when pulling 5433fbe on strossle:master into dc43448 on qualitybath:master.

[coveralls]

Coverage decreased (-4.8%) to 95.238% when pulling 6f6b6e6 on strossle:master into dc43448 on qualitybath:master.

[coveralls]

Coverage decreased (-4.8%) to 95.238% when pulling 6f6b6e6 on strossle:master into dc43448 on qualitybath:master.

[coveralls]

Coverage decreased (-2.4%) to 97.619% when pulling 144e220 on strossle:master into dc43448 on qualitybath:master.

[coveralls]

Coverage decreased (-2.4%) to 97.619% when pulling 144e220 on strossle:master into dc43448 on qualitybath:master.

[gictor]

Sorry for all the commits, does it look ok now?