Update README.md

Author: artemnovichkov

README.md

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 # Github Contribution Graph Example
 
-An example project for [Github Contribution Graph with Swift Charts](https://www.artemnovichkov.com/blog/github-contribution-graph-swift-charts) article.
+An example project for [Github contribution graph with Swift Charts](https://www.artemnovichkov.com/blog/github-contribution-graph-swift-charts) article.
 
 [![Build](https://github.com/artemnovichkov/GithubContributionGraphExample/actions/workflows/build.yml/badge.svg)](https://github.com/artemnovichkov/GithubContributionGraphExample/actions/workflows/build.yml)