Bump acorn from 6.1.0 to 6.4.1

[dependabot[bot]]

Bumps acorn from 6.1.0 to 6.4.1.

Commits

• 9a2e9b6 Mark version 6.4.1
• 90a9548 More rigorously check surrogate pairs in regexp validator
• df0cf1a Mark version 6.4.0
• 5303412 Also export Parser via Parser.acorn
• efe273e give token types and etc to plugins
• ac6decb Mark version 6.3.0
• 7e9817d Allow sourceType: module even with ecmaVersion < 6
• e2b8cc0 Fix broken parsing of new expressions when allowReserved=="never"
• 1555c52 Update acorn.d.ts
• 77c20fa Mark version 6.2.1
• Additional commits viewable in compare view

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[codecov[bot]]

Codecov Report

Merging #133 into master will not change coverage. The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #133   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           8      8           
  Lines         148    148           
=====================================
  Hits          148    148

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