Fixed raise statement typo in appointment_group.py

[dmols]

Proposed Changes

• canvas.py seems to have the same raise statement scenario. Consider verifying if that needs an update as well.

Fixes #430 .

[codecov[bot]]

Codecov Report

Merging #561 (47d329e) into develop (6e749a0) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##           develop      #561   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           67        67           
  Lines         3565      3565           
=========================================
  Hits          3565      3565           

Impacted Files	Coverage Δ
canvasapi/appointment_group.py	100.00% <ø> (ø)
canvasapi/canvas.py	100.00% <ø> (ø)

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