Bump lodash from 4.17.11 to 4.17.15 in /year-in-data-with-python/reveal.js#4

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dependabot/npm_and_yarn/year-in-data-with-python/reveal.js/lodash-4.17.15markwk/python4selftrackers:dependabot/npm_and_yarn/year-in-data-with-python/reveal.js/lodash-4.17.15Copy head branch name to clipboard