Fix/raise exception missing tz

[ssuffian]

No description provided.

[codecov]

Codecov Report

Merging #17 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #17   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          25     25           
  Lines        2352   2425   +73     
=====================================
+ Hits         2352   2425   +73

Impacted Files	Coverage Δ
eeweather/mappings.py	100% <ø> (ø)	⬆️
eeweather/stations.py	100% <100%> (ø)	⬆️
eeweather/exceptions.py	100% <100%> (ø)	⬆️
tests/test_stations.py	100% <100%> (ø)	⬆️

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