fix typo on imdbid parameter

[Guisardo]

There is a typo at the "get_series" code.

Thanks for sharing!

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.77%. Comparing base (879fdc5) to head (6074f61).

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #17   +/-   ##
=======================================
  Coverage   95.77%   95.77%           
=======================================
  Files           4        4           
  Lines         213      213           
=======================================
  Hits          204      204           
  Misses          9        9           

Files with missing lines	Coverage Δ
omdb/omdb.py	94.89% <100.00%> (ø)

[barrust]

Thank you!