Fix parsing yield with dynamicImport

[existentialism]

Q	A
Bug fix?	yes
Breaking change?	no
New feature?	no
Deprecations?	no
Spec compliancy?	no
Tests added/pass?	yes/yes
Fixed tickets	Fixes #378
License	MIT

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@1e74783). Click here to learn what that means.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             master     #383   +/-   ##
=========================================
  Coverage          ?   97.88%           
=========================================
  Files             ?       21           
  Lines             ?     3498           
  Branches          ?      929           
=========================================
  Hits              ?     3424           
  Misses            ?       28           
  Partials          ?       46

Impacted Files	Coverage Δ
src/tokenizer/types.js	100% <ø> (ø)
src/parser/expression.js	97.35% <100%> (ø)

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