docs: fix a link to react-testing-library (#412)

Author: pcowgill

README.md

@@ -15,7 +15,7 @@
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-_Appreciation notice: This project is heavily inspired by [react-testing-library](https://github.com/kentcdodds/react-testing-library). Go check it out and use it to test your web React apps._
+_Appreciation notice: This project is heavily inspired by [react-testing-library](https://github.com/testing-library/react-testing-library). Go check it out and use it to test your web React apps._
 
 ## The problem