Fixed arrow.get with a timestamp and a timezone string

[jadchaar]

Replaces: #744

[codecov-io]

Codecov Report

Merging #746 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master   #746   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           9      9           
  Lines        1649   1667   +18     
  Branches      279    281    +2     
=====================================
+ Hits         1649   1667   +18

Impacted Files	Coverage Δ
arrow/util.py	100% <100%> (ø)	⬆️
arrow/arrow.py	100% <100%> (ø)	⬆️
arrow/parser.py	100% <0%> (ø)	⬆️

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