[misc] Add SemVer compatibility badge to README (#4674)

README.md

@@ -3,6 +3,7 @@
 [![NPM version][npm-version-image]][npm-url] [![NPM downloads][npm-downloads-image]][downloads-url] [![MIT License][license-image]][license-url] [![Build Status][travis-image]][travis-url]
 [![Coverage Status](https://coveralls.io/repos/moment/moment/badge.svg?branch=develop)](https://coveralls.io/r/moment/moment?branch=develop)
 [![FOSSA Status](https://app.fossa.io/api/projects/git%2Bhttps%3A%2F%2Fgithub.com%2Fmoment%2Fmoment.svg?type=shield)](https://app.fossa.io/projects/git%2Bhttps%3A%2F%2Fgithub.com%2Fmoment%2Fmoment?ref=badge_shield)
+[![SemVer compatibility](https://api.dependabot.com/badges/compatibility_score?dependency-name=moment&package-manager=npm_and_yarn&version-scheme=semver)](https://dependabot.com/compatibility-score.html?dependency-name=moment&package-manager=npm_and_yarn&version-scheme=semver)
 
 A lightweight JavaScript date library for parsing, validating, manipulating, and formatting dates.