build(deps): bump acorn from 5.7.3 to 5.7.4

[dependabot[bot]]

Bumps acorn from 5.7.3 to 5.7.4.

Commits

• 6370e90 Mark version 5.7.4
• fbc15b1 More rigorously check surrogate pairs in regexp validator
• See full diff in compare view

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[coveralls]

Coverage remained the same at 89.114% when pulling 6f19074231a9487ef47bf8f0c4d1948a529d2e94 on dependabot/npm_and_yarn/acorn-5.7.4 into 60489415e545efdfd3010ae74b9726facbf08ca8 on master.

[dependabot[bot]]

Looks like acorn is up-to-date now, so this is no longer needed.