Bump acorn from 6.3.0 to 6.4.1 in /sweater/3djs/three.js-master#26

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dependabot/npm_and_yarn/sweater/3djs/three.js-master/acorn-6.4.1algorat/algorat.github.io:dependabot/npm_and_yarn/sweater/3djs/three.js-master/acorn-6.4.1Copy head branch name to clipboard