README: Fix Coverall badge branch

It was still using the `wip` branch which was removed two weeks ago.
rabbitmq · Nov 16, 2021 · 283c31c · 283c31c
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commit 283c31c
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diff --git a/README.md b/README.md
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 # The Khepri database library
 
 [![Test](https://github.com/rabbitmq/khepri/actions/workflows/test.yaml/badge.svg)](https://github.com/rabbitmq/khepri/actions/workflows/test.yaml)
-[![Coverage Status](https://coveralls.io/repos/github/rabbitmq/khepri/badge.svg?branch=wip)](https://coveralls.io/github/rabbitmq/khepri?branch=wip)
+[![Coverage status](https://coveralls.io/repos/github/rabbitmq/khepri/badge.svg?branch=main)](https://coveralls.io/github/rabbitmq/khepri?branch=main)
 
 Khepri is a tree-like replicated on-disk database library for Erlang and
 Elixir.