Update README.md

Author: mertcandav

README.md

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 # The Algorithms - F#
-![.NET Core](https://github.com/TheAlgorithms/F-Sharp/workflows/.NET%20Core/badge.svg)
+[![Run tests on CI](https://github.com/TheAlgorithms/F-Sharp/actions/workflows/tests.yml/badge.svg)](https://github.com/TheAlgorithms/F-Sharp/actions/workflows/tests.yml)
 <br>
 This repository contains algorithms and data structures implemented in F# for eductional purposes.