updated badge

Author: aalavandhan

README.md

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 # Ampleforth
 
-[![Nightly](https://github.com/ampleforth/ampleforth-contracts/actions/workflows/test.yml/badge.svg?branch=main)](https://github.com/ampleforth/ampleforth-contracts/actions/workflows/nightly.yml)  [![Coverage Status](https://coveralls.io/repos/github/frgprotocol/uFragments/badge.svg?branch=master&t=GiWi8p)](https://coveralls.io/github/frgprotocol/uFragments?branch=master)
+[![Nightly](https://github.com/ampleforth/ampleforth-contracts/actions/workflows/nightly.yml/badge.svg)](https://github.com/ampleforth/ampleforth-contracts/actions/workflows/nightly.yml)  [![Coverage Status](https://coveralls.io/repos/github/frgprotocol/uFragments/badge.svg?branch=master&t=GiWi8p)](https://coveralls.io/github/frgprotocol/uFragments?branch=master)
 
 Ampleforth (code name uFragments) is a decentralized elastic supply protocol. It maintains a stable unit price by adjusting supply directly to and from wallet holders. You can read the [whitepaper](https://www.ampleforth.org/paper/) for the motivation and a complete description of the protocol.