fixup new shields io start style

Author: prince-chrismc

README.md

@@ -9,7 +9,7 @@
 
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-[![Stars Badge](https://img.shields.io/github/stars/Thalhammer/jwt-cpp)](https://github.com/Thalhammer/jwt-cpp/stargazers)
+[![Stars Badge](https://img.shields.io/github/stars/Thalhammer/jwt-cpp?style=flat)](https://github.com/Thalhammer/jwt-cpp/stargazers)
 [![GitHub release (latest SemVer including pre-releases)](https://img.shields.io/github/v/release/Thalhammer/jwt-cpp?include_prereleases)](https://github.com/Thalhammer/jwt-cpp/releases)
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