Only convert csvs with a nemseer forecast type in file name

[prakaa]

Closes #38

[codecov-commenter]

Codecov Report

Merging #41 (b51a2bf) into master (0785662) will increase coverage by 0.14%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #41      +/-   ##
==========================================
+ Coverage   95.97%   96.12%   +0.14%     
==========================================
  Files           9        9              
  Lines         721      723       +2     
  Branches      145      146       +1     
==========================================
+ Hits          692      695       +3     
+ Misses         16       15       -1     
  Partials       13       13              

Flag	Coverage Δ
unittests	96.12% <100.00%> (+0.14%)	⬆️

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

Impacted Files	Coverage Δ
src/nemseer/downloader.py	94.73% <100.00%> (+0.05%)	⬆️
src/nemseer/data_handlers.py	93.75% <0.00%> (-1.25%)	⬇️
src/nemseer/data_compilers.py	94.80% <0.00%> (+1.29%)	⬆️

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more