chore: Update branch name in CI workflow

Author: krippner

.github/workflows/ci.yml

@@ -50,7 +50,7 @@ jobs:
 
       - uses: actions/checkout@v4
         with:
-          ref: pvt-devel
+          ref: main
 
       - name: Install CMake and Ninja
         uses: lukka/get-cmake@latest

.github/workflows/coverage.yml

@@ -23,7 +23,7 @@ jobs:
 
       - uses: actions/checkout@v4
         with:
-          ref: pvt-devel
+          ref: main
 
       - name: Install gcovr
         run: pip install gcovr

README.md

@@ -1,7 +1,7 @@
 # AutoDiff: automatic differentiation framework for C++
 
-[![CI Builds](https://github.com/krippner/pvt-auto-diff/actions/workflows/ci.yml/badge.svg)](https://github.com/krippner/pvt-auto-diff/actions/workflows/ci.yml)
-[![Code Coverage](https://img.shields.io/badge/Code_Coverage-99%25-green)](https://coveralls.io/github/krippner/auto-diff?branch=master)
+[![CI Builds](https://github.com/krippner/auto-diff/actions/workflows/ci.yml/badge.svg)](https://github.com/krippner/auto-diff/actions/workflows/ci.yml)
+<!-- [![Code Coverage](https://img.shields.io/badge/Code_Coverage-99%25-green)](https://coveralls.io/github/krippner/auto-diff?branch=master) -->
 <!-- [![Coverage](https://coveralls.io/repos/github/zeromq/cppzmq/badge.svg?branch=master)](https://coveralls.io/github/zeromq/cppzmq?branch=master) -->
 <!-- ![License](https://img.shields.io/github/license/krippner/auto-diff) -->