Switch status badges to Azure Pipelines (DefinitelyTyped#36004)

* Add typescript@next build status badge

* Switch main build badge to Azure as well

Also be more honest about wording -- a green badge doesn't mean a clean
build, just that the most recent changes were clean.

README.md

@@ -11,7 +11,8 @@ Also see the [definitelytyped.org](http://definitelytyped.org) website, although
 This section tracks the health of the repository and publishing process.
 It may be helpful for contributors experiencing any issues with their PRs and packages.
 
-* All packages are [type-checking/linting](https://github.com/Microsoft/dtslint) cleanly: [![Build Status](https://travis-ci.org/DefinitelyTyped/DefinitelyTyped.svg?branch=master)](https://travis-ci.org/DefinitelyTyped/DefinitelyTyped)
+* Most recent build [type-checked/linted](https://github.com/Microsoft/dtslint) cleanly: [![Build Status](https://dev.azure.com/definitelytyped/DefinitelyTyped/_apis/build/status/DefinitelyTyped.DefinitelyTyped?branchName=master)](https://dev.azure.com/definitelytyped/DefinitelyTyped/_build/latest?definitionId=1&branchName=master)
+* All packages are type-checking/linting cleanly on typescript@next: [![Build Status](https://dev.azure.com/definitelytyped/DefinitelyTyped/_apis/build/status/DefinitelyTyped.dtslint-runner?branchName=master)](https://dev.azure.com/definitelytyped/DefinitelyTyped/_build/latest?definitionId=2&branchName=master)
 * All packages are being [published to npm](https://github.com/Microsoft/types-publisher) in under an hour: [![Publish Status](https://typescript.visualstudio.com/TypeScript/_apis/build/status/sandersn.types-publisher-watchdog)](https://typescript.visualstudio.com/TypeScript/_build/latest?definitionId=13)
 * [typescript-bot](https://github.com/typescript-bot) has been active on DefinitelyTyped [![Activity Status](https://typescript.visualstudio.com/TypeScript/_apis/build/status/sandersn.typescript-bot-watchdog)](https://typescript.visualstudio.com/TypeScript/_build/latest?definitionId=14)