Update CHANGELOG

Author: ajanikow

CHANGELOG.md

@@ -1,6 +1,8 @@
 # Change Log
 
 ## [master](https://github.com/arangodb/kube-arangodb/tree/master) (N/A)
+
+## [1.0.0](https://github.com/arangodb/kube-arangodb/tree/1.0.0) (2020-03-03)
 - Removal of v1alpha support for ArangoDeployment, ArangoDeploymentReplication, ArangoBackup
 - Added new command to operator - version