Add fold kwarg for arrow.get

[nik-k11]

Pull Request Checklist

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• 🧪 Added tests for changed code.
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Description of Changes

• Add fold kwarg for arrow.get.
• Remove getattr since Python 2.7/3.5 support is dropped.
• Make fold a keyword-only argument for Arrow.__init__ per this discussion.

Also please note the fold documentation in ArrowFactory.get. Basically, I only relay the fold kwarg into Arrow.fromdatetime and Arrow.__init__ calls.

Doesn't seem like using fold for timestamps, now calls or dates makes sense. But maybe it should be passed. What do you think?

Closes: #872

[nik-k11]

This basically checks for presence of the Arrow.fold property, seems unnecessary.

[codecov]

Codecov Report

Base: 100.00% // Head: 100.00% // No change to project coverage 👍

Coverage data is based on head (4d68b9c) compared to base (74a759b).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff            @@
##            master     #1139   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            9         9           
  Lines         2319      2325    +6     
  Branches       492       495    +3     
=========================================
+ Hits          2319      2325    +6     

Impacted Files	Coverage Δ
arrow/api.py	100.00% <ø> (ø)
arrow/arrow.py	100.00% <100.00%> (ø)
arrow/factory.py	100.00% <100.00%> (ø)

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