fix: class, ternary, and arrow function miss parentheses

[davidbonnet]

Fixes #477
Fixes #478
Fixes #479

[codecov]

Codecov Report

Merging #504 (68a8492) into master (2dfdef1) will increase coverage by 0.06%.
The diff coverage is 100.00%.

❗ Current head 68a8492 differs from pull request most recent head e30406b. Consider uploading reports for the commit e30406b to get more accurate results

@@            Coverage Diff             @@
##           master     #504      +/-   ##
==========================================
+ Coverage   94.97%   95.04%   +0.06%     
==========================================
  Files           1        1              
  Lines        1134     1150      +16     
==========================================
+ Hits         1077     1093      +16     
  Misses         57       57              

Impacted Files	Coverage Δ
src/astring.js	95.04% <100.00%> (+0.06%)	⬆️

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[davidbonnet]

Thanks a lot @NotWearingPants for reporting these issues.