修复周日课程错位BUG

[wolfbolin]

No description provided.

[codecov-io]

Codecov Report

Merging #15 into master will decrease coverage by 0.03%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master      #15      +/-   ##
==========================================
- Coverage   33.63%   33.59%   -0.04%     
==========================================
  Files          23       23              
  Lines        1784     1786       +2     
==========================================
  Hits          600      600              
- Misses       1184     1186       +2

Impacted Files	Coverage Δ
everyclass/server/calendar/ics_generator.py	25.28% <0%> (-0.6%)	⬇️

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