This is in response to [this conversation](https://github.com/badges/shields/issues/2237#issuecomment-446812796). The change turned out being even easier than I had anticipated because the [API supports a buildStatus filter](https://docs.microsoft.com/en-us/rest/api/azure/devops/build/builds/list?view=azure-devops-rest-5.0#buildstatus). I did quite a bit of local testing to make sure this is solid. I also ran tests and checked coverage.