Replace Travis and Codecov badges with Gitlab pipeline badge.
Travis has been replaced by Gitlab pipelines, and Codecov will be
replaced soon as well.
The pipeline depends on Appveyor, but I'm keeping the badge up anyway
because I want to make it clear that Windows is supported.
-Linux: [![Linux Build](https://travis-ci.org/FascinatedBox/lily.svg?branch=main)](https://travis-ci.org/FascinatedBox/lily)
-
-Windows: [![Windows Build](https://ci.appveyor.com/api/projects/status/gitlab/FascinatedBox/lily?svg=true)](https://ci.appveyor.com/project/FascinatedBox/lily)
-
-Test Coverage: [![codecov](https://codecov.io/gh/FascinatedBox/lily/branch/master/graph/badge.svg)](https://codecov.io/gh/FascinatedBox/lily)
+[![Pipeline Status](https://gitlab.com/FascinatedBox/lily/badges/main/pipeline.svg)](https://gitlab.com/FascinatedBox/lily/-/commits/main) [![Windows Build](https://ci.appveyor.com/api/projects/status/gitlab/FascinatedBox/lily?svg=true)](https://ci.appveyor.com/project/FascinatedBox/lily)
## Lily
