Feature/modernise setup

[gnikit]

Closes #44
Closes #34
Closes #33

[codecov]

Codecov Report

Merging #44 (dc59da7) into dev (0057f62) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##              dev      #44      +/-   ##
==========================================
- Coverage   81.02%   81.02%   -0.01%     
==========================================
  Files          10        9       -1     
  Lines        4290     4289       -1     
==========================================
- Hits         3476     3475       -1     
  Misses        814      814              

Impacted Files	Coverage Δ
fortls/constants.py	100.00% <100.00%> (ø)
fortls/interface.py	100.00% <100.00%> (ø)
fortls/langserver.py	71.85% <100.00%> (ø)
fortls/objects.py	80.70% <100.00%> (ø)

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[gnikit]

@ZedThree FYI I changed the tests target to dev