badge style

Author: vzhn

readme.md

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 ![Travis (.org)](https://img.shields.io/travis/vzhn/netty-http-authenticator?style=plastic)
-![Maven Central](https://img.shields.io/maven-central/v/io.github.vzhn/netty-http-authenticator)
+![Maven Central](https://img.shields.io/maven-central/v/io.github.vzhn/netty-http-authenticator?style=plastic)
 
 ### BasicNetyHttpAuthenticator
 `BasicNettyHttpAuthenticator` just appends the auth header to an every request.