Add support for python 3.8

[stealthycoin]

No description provided.

[codecov-io]

Codecov Report

Merging #1922 into develop will increase coverage by 0.13%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           develop    #1922      +/-   ##
===========================================
+ Coverage    92.66%   92.79%   +0.13%     
===========================================
  Files           53       53              
  Lines        10175    10332     +157     
===========================================
+ Hits          9429     9588     +159     
+ Misses         746      744       -2

Impacted Files	Coverage Δ
botocore/session.py	98.13% <100%> (+0.01%)	⬆️
botocore/awsrequest.py	98.37% <100%> (+0.01%)	⬆️
botocore/compat.py	94.11% <100%> (+0.19%)	⬆️
botocore/signers.py	98.11% <0%> (-0.42%)	⬇️
botocore/config.py	100% <0%> (ø)	⬆️
botocore/discovery.py	100% <0%> (ø)	⬆️
botocore/eventstream.py	100% <0%> (ø)	⬆️
botocore/args.py	100% <0%> (ø)	⬆️
botocore/configprovider.py	93.37% <0%> (ø)	⬆️
botocore/parsers.py	99.79% <0%> (ø)	⬆️
... and 14 more

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[jamesls]

I think we should properly support 3.8 this and not just let the misc. warnings propagate. I think we build on https://github.com/boto/botocore/pull/1865/files as part of this change. Only thing I'd change in that PR is moving the try/except into compat.

[jamesls]

Let's move the imports to compat.py and then we should be good.

[jamesls]

This is what I was referring to when I mentioned moving the try/except into a compat module. It's repeated 3 times and is a perfect fit for compat.py.

[jamesls]

@joguSD Updated compat module, should be ready to look at again. Just waiting for travis to pass.