(build) Fix TeamCity badge URL in README

Update TeamCity build status badge to use the new shields.io format and point to teamcity.jetbrains.com instead of the
deprecated teamcity.codebetter.com. Also upgrades links from HTTP to HTTPS.

Author: devlead

README.md

@@ -19,7 +19,7 @@ Cake (C# Make) is a build automation system with a C# DSL to do things like comp
 | Azure Pipelines             | Centos                  | [![Azure Pipelines Cake Centos status](https://dev.azure.com/cake-build/Cake/_apis/build/status/Azure%20Pipelines%20-%20Build%20Cake%20Centos%207?&branchName=develop)](https://dev.azure.com/cake-build/Cake/_build/latest?definitionId=5)        |                                                                                                                                                                     |
 | Azure Pipelines             | Ubuntu                  | [![Azure Pipelines Ubuntu Build status](https://dev.azure.com/cake-build/Cake/_apis/build/status/Azure%20Pipelines%20-%20Build%20Cake%20Ubuntu?&branchName=develop)](https://dev.azure.com/cake-build/Cake/_build/latest?definitionId=3)           |                                                                                                                                                                     |
 | AppVeyor                    | Windows                 | [![AppVeyor branch](https://img.shields.io/appveyor/ci/cakebuild/cake/develop.svg)](https://ci.appveyor.com/project/cakebuild/cake/branch/develop)                                                                                                 | [![AppVeyor branch](https://img.shields.io/appveyor/ci/cakebuild/cake-eijwj/develop.svg)](https://ci.appveyor.com/project/cakebuild/cake-eijwj)                     |
-| TeamCity                    | Windows                 | [![TeamCity Build Status](http://img.shields.io/teamcity/codebetter/Cake_CakeMaster.svg)](http://teamcity.codebetter.com/viewType.html?buildTypeId=Cake_CakeMaster)                                                                                |                                                                                                                                                                     |
+| TeamCity                    | Windows                 | [![TeamCity Build Status](https://img.shields.io/teamcity/build/s/Cake_CakeMaster?server=https://teamcity.jetbrains.com)](https://teamcity.jetbrains.com/viewType.html?buildTypeId=Cake_CakeMaster)                                                                                |                                                                                                                                                                     |
 | Bitrise                     | MacOS                   | [![Build Status](https://app.bitrise.io/app/42eaef77e8db4a5c/status.svg?token=EDjHGK5njNJ-MrhSbvKM1w&branch=develop)](https://app.bitrise.io/app/42eaef77e8db4a5c)                                                                                 | ![Build Status](https://app.bitrise.io/app/804b431c1f27e0a0/status.svg?token=qKosHEaJAJEqzZcq4s5WRg&branch=develop)                                                 |
 | Bitrise                     | Debian                  | [![Build Status](https://app.bitrise.io/app/ea0c6b3c61eb1e79/status.svg?token=KJqOWXllYXz3WYqcB861Uw&branch=develop)](https://app.bitrise.io/app/ea0c6b3c61eb1e79)                                                                                 | ![Build Status](https://app.bitrise.io/app/5a406f34f22113c6/status.svg?token=TQPbsmA9yP-iJOhzunIP4w&branch=develop)                                                 |
 | Bitbucket Pipelines         | Debian                  | [![Build Status](https://cakebitbucketpipelinesshield.azurewebsites.net/status/cakebuild/cake-integration-tests/develop)](https://cakebitbucketpipelinesshield.azurewebsites.net/url/cakebuild/cake-integration-tests/develop)                     |                                                                                                                                                                     |