Using ABCs from collections instead of collections.abc is deprecated.

[JulienPalard]

And it will stop working in Python 3.8 according to the warning.

[codecov-io]

Codecov Report

Merging #609 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@ Coverage Diff @@## master #609 +/- ##
==========================================
+ Coverage 90.31% 90.31% +<.01% 
==========================================
Files 24 24 Lines 4128 4129 +1 ==========================================
+ Hits 3728 3729 +1 
Misses 400 400

Impacted Files	Coverage Δ
babel/_compat.py	98.11% <100%> (+0.07%)	⬆️
babel/localedata.py	95.41% <100%> (-0.05%)	⬇️

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[akx]

Thank you! Very elegant patch.

[tirkarthi]

It will be good to have a release since the upstream CPython PR is close to getting merged : python/cpython#10596

Thanks!