Update changelog for 19.0.0 release.

docs/changelog.md

@@ -4,14 +4,22 @@ title: Changelog
 permalink: /changelog/
 ---
 
-# 19.0.0-SNAPSHOT (In Development)
+# 20.0.0-SNAPSHOT (In Development)
 
-* [Commits](https://github.com/mozilla-mobile/android-components/compare/v18.0.0...v19.0.0)
-* [Milestone](https://github.com/mozilla-mobile/android-components/milestone/79?closed=1)
+* [Commits](https://github.com/mozilla-mobile/android-components/compare/v19.0.0...master)
+* [Milestone](https://github.com/mozilla-mobile/android-components/milestone/80?closed=1)
 * [Dependencies](https://github.com/mozilla-mobile/android-components/blob/master/buildSrc/src/main/java/Dependencies.kt)
 * [Gecko](https://github.com/mozilla-mobile/android-components/blob/master/buildSrc/src/main/java/Gecko.kt)
 * [Configuration](https://github.com/mozilla-mobile/android-components/blob/master/buildSrc/src/main/java/Config.kt)
 
+# 19.0.0
+
+* [Commits](https://github.com/mozilla-mobile/android-components/compare/v18.0.0...v19.0.0)
+* [Milestone](https://github.com/mozilla-mobile/android-components/milestone/79?closed=1)
+* [Dependencies](https://github.com/mozilla-mobile/android-components/blob/v19.0.0/buildSrc/src/main/java/Dependencies.kt)
+* [Gecko](https://github.com/mozilla-mobile/android-components/blob/v19.0.0/buildSrc/src/main/java/Gecko.kt)
+* [Configuration](https://github.com/mozilla-mobile/android-components/blob/v19.0.0/buildSrc/src/main/java/Config.kt)
+
 * **browser-toolbar**
   * ⚠️ **This is a breaking change**: Refactored the internals to use `ConstraintLayout`. As part of this change the public API was simplified and unused methods/properties have been removed.