Bump acorn from 6.1.1 to 6.4.1 in /three.js-master#5

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dependabot/npm_and_yarn/three.js-master/acorn-6.4.1hoevf123/hoevf123.github.io:dependabot/npm_and_yarn/three.js-master/acorn-6.4.1Copy head branch name to clipboard