Update README.md

Remove codecov from the list as we can't specify entry point - it seems to be meaningless for an event driven application.

README.md

@@ -8,7 +8,6 @@
 [![Maintenance](https://img.shields.io/badge/Maintained%3F-yes-green.svg )](https://github.com/AlphaWallet/alpha-wallet-android/graphs/commit-activity)
 ![GitHub contributors](https://img.shields.io/github/contributors/AlphaWallet/alpha-wallet-android.svg)
 [![MIT license](https://img.shields.io/badge/License-MIT-blue.svg)](https://github.com/AlphaWallet/alpha-wallet-android/blob/master/LICENSE)
-[![codecov](https://codecov.io/gh/AlphaWallet/alpha-wallet-android/branch/master/graph/badge.svg?token=IkoEb30CXq)](https://codecov.io/gh/AlphaWallet/alpha-wallet-android)
 
 AlphaWallet is an open source programmable blockchain apps platform. It's compatible with tokenisation framework TokenScript, offering businesses and their users in-depth token interaction, a clean white label user experience and advanced security options. Supports all Ethereum based networks.