Bump acorn from 7.0.0 to 7.1.1

Bumps acorn from 7.0.0 to 7.1.1.

Commits

6d19489 Mark release 7.1.1
793c0e5 More rigorously check surrogate pairs in regexp validator
b5c1787 Fix incorrect comment in regexp parser
12ae8fe Parameterize dummy value and export isDummy
fa3ad8c Further refine acorn-walk types
1d50286 Fix some errors in walk types
97801f0 Mark acorn-walk 7.1.1
e9372c1 Further clean up walker types
de6edeb Remove NarrowNode from walk.d.ts
1d85e7c Fix: acorn-walk type work with acorn's
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diverent2 / flagfinder

Bump acorn from 7.0.0 to 7.1.1 #53