Update CHANGELOG.md

Author: arhimede

CHANGELOG.md

@@ -1,3 +1,21 @@
+## 3.1.0 - 2020-11-02
+
+### Changed
+* Composer 2 compatibility.
+* Update composer.json to require version 2 of laminas/laminas-dependency-plugin to be Composer 2 compatible.
+
+### Added
+* Nothing
+
+### Deprecated
+* Nothing
+
+### Removed
+* Nothing
+
+### Fixed
+* Nothing
+
 ## 3.0.2 - 2020-04-23
 
 Updated keywords