Adding brief parameter to humanize

[akotha7]

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• [x] 🧪 Added tests for changed code.
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Description of Changes

• Added brief optional parameter to humanize function, based off #1001
• Added associated tests inside test_arrow.py
• Updated documentation to reflect new feature

Questions

Current implementation shortens into only_distance and then each term. One edge case that occurs for example is "an hour and 6 minutes" should that become "h 6m" or "1h 6m"

Closes #1001

[codecov[bot]]

Codecov Report

Merging #1075 (d70fc86) into master (be57df5) will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master     #1075   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           10        10           
  Lines         2232      2243   +11     
  Branches       437       441    +4     
=========================================
+ Hits          2232      2243   +11     

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

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[anishnya]

@jadchaar @krisfremen @systemcatch, what are your thoughts here?

[systemcatch]

@akotha7 I tend to think we should use the 1h 6m as this seems more consistent to me.

I will try to look this over properly in the next few days.