feat: elixir language support

[aldy505]

closes #43

[codecov]

Codecov Report

Merging #52 (0afefdc) into master (20ff9c6) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master       #52   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           24        25    +1     
  Lines          880       897   +17     
  Branches        43        43           
=========================================
+ Hits           880       897   +17     

Impacted Files	Coverage Δ
src/index.ts	100.00% <100.00%> (ø)
src/languages/elixir.ts	100.00% <100.00%> (ø)
src/languages/markdown.ts	100.00% <100.00%> (ø)

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