Change discord model created_at times from datetime.datetime to arrow.Arrow

[onerandomusername]

depends on #93

hacks discord.utils to return arrow.Arrow instead of datetime.datetime.

[codecov[bot]]

Codecov Report

Merging #92 (4f9cc9a) into feat/utils-time (a2adec4) will increase coverage by 0.51%. The diff coverage is 94.11%.

@@                 Coverage Diff                 @@
##           feat/utils-time      #92      +/-   ##
===================================================
+ Coverage            70.38%   70.90%   +0.51%     
===================================================
  Files                   29       29              
  Lines                 1540     1574      +34     
  Branches               162      164       +2     
===================================================
+ Hits                  1084     1116      +32     
- Misses                 429      431       +2     
  Partials                27       27              

Impacted Files	Coverage Δ
modmail/__main__.py	0.00% <0.00%> (ø)
modmail/utils/time.py	100.00% <100.00%> (ø)
tests/conftest.py	80.00% <100.00%> (+13.33%)	:arrow_up:
tests/mocks.py	92.43% <100.00%> (+0.03%)	:arrow_up:
tests/modmail/utils/test_time.py	100.00% <100.00%> (ø)

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[dpulls[bot]]

:tada: All dependencies have been resolved !

[dpulls[bot]]

:tada: All dependencies have been resolved !

[onerandomusername]

Not worth the possible bugs caused from this, IMO.