Bump acorn from 6.2.1 to 6.4.2

Bumps acorn from 6.2.1 to 6.4.2.

Commits

f6b83ed Mark version 6.4.2
f51895b Fix potentially-exponential regular expression in use-strict-scanning
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"
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dariye / isbn

Bump acorn from 6.2.1 to 6.4.2 #15