doc: removed broken badge

README.md

@@ -3,7 +3,6 @@
 <!--
 @cond TURN_OFF_DOXYGEN
 -->
-[![GitHub version](https://badge.fury.io/gh/skypjack%2Fentt.svg)](https://github.com/skypjack/entt/releases)
 [![Build Status](https://github.com/skypjack/entt/workflows/build/badge.svg)](https://github.com/skypjack/entt/actions)
 [![Coverage](https://codecov.io/gh/skypjack/entt/branch/master/graph/badge.svg)](https://codecov.io/gh/skypjack/entt)
 [![Try online](https://img.shields.io/badge/try-online-brightgreen)](https://godbolt.org/z/cOUcm1)