Bump acorn from 6.3.0 to 6.4.1 in /playground/blockly_html/google-block#2

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dependabot/npm_and_yarn/playground/blockly_html/google-block/acorn-6.4.1i10/StatHunt:dependabot/npm_and_yarn/playground/blockly_html/google-block/acorn-6.4.1Copy head branch name to clipboard