Update grammars to 0.20

[Luni-4]

This PR:

• Updates every grammar to 0.20
• Fix tests

[codecov-commenter]

Codecov Report

Base: 68.31% // Head: 68.16% // Decreases project coverage by -0.15% ⚠️

Coverage data is based on head (6365744) compared to base (70f5f46).
Patch coverage: 2.50% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #954      +/-   ##
==========================================
- Coverage   68.31%   68.16%   -0.16%     
==========================================
  Files          60       60              
  Lines       12303    12342      +39     
==========================================
+ Hits         8405     8413       +8     
- Misses       3898     3929      +31     

Impacted Files	Coverage Δ
src/checker.rs	74.25% <ø> (ø)
src/languages/language_java.rs	3.25% <0.00%> (-0.24%)	⬇️
src/languages/language_javascript.rs	8.39% <0.00%> (-0.07%)	⬇️
src/languages/language_python.rs	6.61% <0.00%> (-0.44%)	⬇️
src/languages/language_rust.rs	6.06% <0.00%> (ø)
src/languages/language_tsx.rs	6.08% <0.00%> (ø)
src/languages/language_typescript.rs	6.26% <0.00%> (ø)
src/metrics/loc.rs	97.83% <100.00%> (ø)
src/getter.rs	85.33% <0.00%> (+2.00%)	⬆️
tests/test.rs	94.28% <0.00%> (+2.85%)	⬆️

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[marco-c]

Thanks!