Add support for UncheckedStatement blocks

[cgewecke]

#626

[codecov-commenter]

Codecov Report

Merging #712 (8a5f68a) into master (ede386e) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #712   +/-   ##
=======================================
  Coverage   98.69%   98.69%           
=======================================
  Files          22       22           
  Lines         997      999    +2     
=======================================
+ Hits          984      986    +2     
  Misses         13       13           

Impacted Files	Coverage Δ
lib/parse.js	97.24% <100.00%> (+0.05%)	⬆️

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