Bump acorn from 5.7.3 to 5.7.4 in /lecture-3/code-splitting#8

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dependabot/npm_and_yarn/lecture-3/code-splitting/acorn-5.7.4st6io/react-web-apps-master-class-course:dependabot/npm_and_yarn/lecture-3/code-splitting/acorn-5.7.4Copy head branch name to clipboard