message: Move code coverage to a pinned issue
  As discussed:
diff: |- |- |
  | Community Chat | [![Gitter](https://badges.gitter.im/MSRC-CCF/community.svg)](https://gitter.im/MSRC-CCF/community?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge) |
  | Continuous Integration | [![Build Status](https://dev.azure.com/MSRC-CCF/CCF/_apis/build/status/CCF%20Github%20CI?branchName=master)](https://dev.azure.com/MSRC-CCF/CCF/_build/latest?definitionId=3&branchName=master) |
  -| Code coverage | [![codecov](https://codecov.io/gh/microsoft/CCF/branch/master/graph/badge.svg)](https://codecov.io/gh/microsoft/CCF) |
  | Documentation | [![docs](https://dev.azure.com/MSRC-CCF/CCF/_apis/build/status/CCF%20GitHub%20Pages?branchName=master)](https://microsoft.github.io/CCF/) |
  | Daily Build | [![Build Status](https://dev.azure.com/MSRC-CCF/CCF/_apis/build/status/CCF%20GitHub%20Daily?branchName=master)](https://dev.azure.com/MSRC-CCF/CCF/_build/latest?definitionId=7&branchName=master) |
  