Remove Twitter badge from README

Removed Twitter badge from README.

Author: GieziJo

README.md

@@ -1,7 +1,6 @@
 [![Releases](https://img.shields.io/github/release/GieziJo/ScriptableObjectVariant.svg)](https://github.com/GieziJo/ScriptableObjectVariant/releases/latest)
 [![openupm](https://img.shields.io/npm/v/ch.giezi.tools.scriptableobjectvariant?label=openupm&registry_uri=https://package.openupm.com)](https://openupm.com/packages/ch.giezi.tools.scriptableobjectvariant/)
 [![License: MIT](https://img.shields.io/badge/License-MIT-brightgreen.svg)](https://github.com/GieziJo/ScriptableObjectVariant/blob/master/LICENSE.txt)
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 # Scriptable Object Variant for Unity (Scriptable Object Data Overrider)