updated changelog and readme

Author: Zhihang Yao

CHANGES.md

@@ -1,7 +1,7 @@
 Change Log
 ==========
 
-### 2.1.0-SNAPSHOT
+### 2.1.0
 
 #### Changes
 * Use the new default view implementations of GUI plugin.

README.md

@@ -46,6 +46,8 @@ System requirements
 Each version of the ADE Manager plugin is built against a specific version of the Importer/Exporter.
 Please check the release notes of the version you want to use for more information. 
 
+Please Note that the ADE Manager Plugin may not work with Java 17 or later versions.
+
 Documentation
 -------------
 A complete and comprehensive user manual on the ADE Manager Plugin is available