Remove 'preview' tag from version for verification.

com.unity.ml-agents/CHANGELOG.md

 and this project adheres to
 [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
+## [1.0.2] - 2020-06-04
+### Minor Changes
+#### com.unity.ml-agents (C#)
+- Remove 'preview' tag.
+
 ## [1.0.2-preview] - 2020-05-19
 ### Bug Fixes
 #### com.unity.ml-agents (C#)

com.unity.ml-agents/Runtime/Academy.cs

         /// Unity package version of com.unity.ml-agents.
         /// This must match the version string in package.json and is checked in a unit test.
         /// </summary>
-        internal const string k_PackageVersion = "1.0.2-preview";
+        internal const string k_PackageVersion = "1.0.2";
 
         const int k_EditorTrainingPort = 5004;
 

com.unity.ml-agents/package.json

 {
   "name": "com.unity.ml-agents",
   "displayName": "ML Agents",
-  "version": "1.0.2-preview",
+  "version": "1.0.2",
-    "com.unity.barracuda": "0.7.1-preview"
+    "com.unity.barracuda": "1.0.0"
-}
+}