Fixed deprecation warning for importing ABC's from collections

[timworx]

Fixed deprecation warnings popping up in 3.7

DeprecationWarning: Using or importing the ABCs from 'collections' instead of from 'collections.abc' is deprecated, and in 3.8 it will stop working

Tested and passing in 3.6.2 & 3.7.0

Side note: Current tests fail in 3.6.0, seems to be a sqlite error of some sort.

[coveralls]

Coverage remained the same at 100.0% when pulling 186f662 on timworx:update-collections-import into 755ee18 on vxgmichel:master.

[vxgmichel]

Hi @timworx, thanks for the PR!

Side note: Current tests fail in 3.6.0, seems to be a sqlite error of some sort.

I tried to reproduce this issue and I did get some weird internal errors from coverage, although the tests are actually passing in my environment. I think I'll ignore it for the moment.

[timworx]

Interesting, might be something to do with my env then (either way, it didn't seem like a terribly important bug).

If it is somehow env related then adding a Pipfile might help.

[timworx]

And thanks for the merge! 👍