Merge pull request #12 from ker0x/hotfix/changelog

Update CHANGELOG

Author: ker0x

CHANGELOG.md

@@ -6,6 +6,8 @@ The Fcm library follows [SemVer](http://semver.org/).
 
 Version `2.x` of this library is a full rewrite to be compliant with [HTTP v1 API](https://firebase.google.com/docs/reference/fcm/rest/v1/projects.messages). If you are on Legacy HTTP API, then you should consider using version `1.x`
 
+**Changelog** (since [`2.0.0`](https://github.com/ker0x/fcm/compare/2.0.0...2.1.0))
+
 - 2.1.0 (2020-01)
     - Change class properties visibility from `protected` to `private`.
     - Add new configurations classes 
@@ -39,6 +41,8 @@ Version `2.x` of this library is a full rewrite to be compliant with [HTTP v1 AP
     - Method `Kerox\Fcm\Model\Message\Webpush::setOptions()`, type `array` is deprecated, use class `Kerox\Fcm\Model\Message\Options\WebpushOptions::class` instead.
     - Method `Kerox\Fcm\Model\Message\AbstractNotification\Alert::setActionLocKey()` is deprecated and will be removed in 3.0 with no replacement.
 
+**Changelog** (since [`1.0.1`](https://github.com/ker0x/fcm/compare/1.0.1...2.0.0))
+
 - 2.0.0 (2018-09)
     - Rewrite library to be compatible with [HTTP v1 API](https://firebase.google.com/docs/reference/fcm/rest/v1/projects.messages)
     - Improve tests