Update README.md

Author: vbmacher

README.md

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 ![Build for intellij-cucumber-scala](https://github.com/vbmacher/intellij-cucumber-scala/workflows/Build%20for%20intellij-cucumber-scala/badge.svg)
 
+<a href="https://www.buymeacoffee.com/vbmacher" target="_blank"><img src="https://www.buymeacoffee.com/assets/img/custom_images/orange_img.png" alt="Buy Me A Coffee" style="height: 41px !important;width: 174px !important;box-shadow: 0px 3px 2px 0px rgba(190, 190, 190, 0.5) !important;-webkit-box-shadow: 0px 3px 2px 0px rgba(190, 190, 190, 0.5) !important;" ></a>
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 A [plugin to IntelliJ IDEA](https://plugins.jetbrains.com/plugin/7460-cucumber-for-scala),
 enabling navigation between step definitions and gherkin steps when using cucumber-scala DSL.