Bump acorn from 6.1.1 to 6.4.1#2

hugolgst merged 1 commit intomasterhugolgst/ruby-codegolf:masterfrom

dependabot/npm_and_yarn/acorn-6.4.1hugolgst/ruby-codegolf:dependabot/npm_and_yarn/acorn-6.4.1Copy head branch name to clipboard