[ISSUE-177] Add test for relative date time for locales

[jama5262]

What does this PR do?

Add test for relative date time for locales

Resolves #177

[codecov-commenter]

Codecov Report

Base: 94.04% // Head: 96.21% // Increases project coverage by +2.17% 🎉

Coverage data is based on head (784477b) compared to base (56ed1ca).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #181      +/-   ##
===========================================
+ Coverage    94.04%   96.21%   +2.17%     
===========================================
  Files           37       37              
  Lines         1797     1797              
===========================================
+ Hits          1690     1729      +39     
+ Misses         107       68      -39     

Impacted Files	Coverage Δ
lib/src/jiffy.dart	90.88% <ø> (ø)
lib/src/locale/available_locales.dart	100.00% <ø> (ø)
lib/src/display.dart	100.00% <100.00%> (ø)
lib/src/locale/locale.dart	100.00% <100.00%> (ø)
lib/src/locale/locales/arLocale.dart	87.06% <100.00%> (ø)
lib/src/locale/locales/azLocale.dart	89.58% <100.00%> (+12.50%)	⬆️
lib/src/locale/locales/bnLocale.dart	100.00% <100.00%> (ø)
lib/src/locale/locales/deLocale.dart	100.00% <100.00%> (ø)
lib/src/locale/locales/enLocale.dart	100.00% <100.00%> (ø)
lib/src/locale/locales/esLocale.dart	100.00% <100.00%> (ø)
... and 22 more

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