Drop support for Python 3.5

[hugovk]

Fixes #130.

[codecov-commenter]

Codecov Report

Merging #151 into master will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #151   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            9         9           
  Lines          554       554           
=========================================
  Hits           554       554           

Flag	Coverage Δ
#GHA_Ubuntu	100.00% <100.00%> (ø)
#GHA_Windows	100.00% <100.00%> (ø)
#GHA_macOS	100.00% <100.00%> (ø)

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Impacted Files	Coverage Δ
tests/test_number.py	100.00% <ø> (ø)
src/humanize/number.py	100.00% <100.00%> (ø)
src/humanize/time.py	100.00% <100.00%> (ø)
tests/test_time.py	100.00% <100.00%> (ø)

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