Add CLI support for jsx pragmas

[jozanza]

closes #319

[codecov-io]

Codecov Report

Merging #321 into master will decrease coverage by 0.02%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master     #321      +/-   ##
==========================================
- Coverage   76.64%   76.61%   -0.03%     
==========================================
  Files          41       41              
  Lines        5454     5456       +2     
  Branches     1277     1279       +2     
==========================================
  Hits         4180     4180              
- Misses        898      900       +2     
  Partials      376      376

Impacted Files	Coverage Δ
src/cli.ts	0% <0%> (ø)	⬆️

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[alangpierce]

Thanks!