Update CHANGELOG.md

Author: bobmulder

CHANGELOG.md

@@ -2,6 +2,9 @@
 
 All notable changes to `php-number` will be documented in this file
 
+## 1.2.0 - 2021-01-20
+- Added PHP 8 support + type fix ([#8](https://github.com/madebybob/php-number/pull/8) by [@affektde](https://github.com/affektde))
+
 ## 1.1.0 - 2021-01-05
 - Removed `AbstractNumber::create()` in favor of extensibility. Added to the default `Number` class.
 (it was not possible to extend the method by adding arguments in `AbstractNumber` implementations).