Update changelog.md

Author: jessuppi

changelog.md

@@ -1,14 +1,18 @@
-== Changelog ==
+## Changelog
 
-= 1.2.0 =
+### 1.2.1
+* improved `composer.json`
+* updated meta data
+
+### 1.2.0
 * tested with PHP 7.0, 7.1, 7.2
+* added support for PHP `strict_types`
 * dropped support for PHP 5.x and earlier versions
-* added support for PHP strict_types
 * minor code tweaks
 
-= 1.1.0 =
-* added supported for OBJECT_CACHE defined constant (rudimentary)
+### 1.1.0
+* added supported for `OBJECT_CACHE` defined constant (rudimentary)
 * recommended not to use this version
 
-= 1.0.0 =
-* duplicated from PressJitsu Redis Object Cache
+### 1.0.0
+* forked from PressJitsu Redis Object Cache