Run CI on mater branch

[regen100]

This PR fixes the workflow to run tests on the master branch.

[codecov]

Codecov Report

Merging #57 (38c56a7) into master (4be7657) will decrease coverage by 1.70%.
The diff coverage is 93.75%.

@@            Coverage Diff             @@
##           master      #57      +/-   ##
==========================================
- Coverage   93.75%   92.04%   -1.71%     
==========================================
  Files           5        3       -2     
  Lines         464      327     -137     
==========================================
- Hits          435      301     -134     
+ Misses         29       26       -3     

Flag	Coverage Δ
unittests	92.04% <93.75%> (-1.71%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/cmake_language_server/server.py	87.28% <92.10%> (+0.73%)	⬆️
src/cmake_language_server/__init__.py	100.00% <100.00%> (ø)
src/cmake_language_server/api.py	94.60% <100.00%> (ø)

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