Update to pre2

DevProject/Packages/packages-lock.json

 {
   "dependencies": {
     "com.unity.barracuda": {
-      "version": "1.4.0-preview",
+      "version": "2.0.0-pre.2",
       "depth": 1,
       "source": "registry",
       "dependencies": {
       "depth": 0,
       "source": "local",
       "dependencies": {
-        "com.unity.barracuda": "1.4.0-preview",
+        "com.unity.barracuda": "2.0.0-pre.2",
         "com.unity.modules.imageconversion": "1.0.0",
         "com.unity.modules.jsonserialize": "1.0.0"
       }
       "depth": 0,
       "source": "local",
       "dependencies": {
-        "com.unity.ml-agents": "2.0.0-pre.1",
+        "com.unity.ml-agents": "2.0.0-pre.2",
         "com.unity.modules.physics": "1.0.0"
       }
     },

Project/Packages/packages-lock.json

       "depth": 0,
       "source": "local",
       "dependencies": {
-        "com.unity.ml-agents": "2.0.0-pre.1",
+        "com.unity.ml-agents": "2.0.0-pre.2",
         "com.unity.modules.physics": "1.0.0"
       }
     },

com.unity.ml-agents.extensions/package.json

   "unity": "2019.4",
   "description": "A source-only package for new features based on ML-Agents",
   "dependencies": {
-    "com.unity.ml-agents": "2.0.0-pre.1",
+    "com.unity.ml-agents": "2.0.0-pre.2",
     "com.unity.modules.physics": "1.0.0"
   }
 }

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 = "2.0.0-pre.1";
+        internal const string k_PackageVersion = "2.0.0-pre.2";
 
         const int k_EditorTrainingPort = 5004;
 
                 // This try-catch is because DontDestroyOnLoad cannot be used in Editor Tests
                 GameObject.DontDestroyOnLoad(m_StepperObject);
             }
-            catch { }
+            catch {}
         }
 
         /// <summary>
 
         void ResetActions()
         {
-            DecideAction = () => { };
-            DestroyAction = () => { };
-            AgentPreStep = i => { };
-            AgentSendState = () => { };
-            AgentAct = () => { };
-            AgentForceReset = () => { };
-            OnEnvironmentReset = () => { };
+            DecideAction = () => {};
+            DestroyAction = () => {};
+            AgentPreStep = i => {};
+            AgentSendState = () => {};
+            AgentAct = () => {};
+            AgentForceReset = () => {};
+            OnEnvironmentReset = () => {};
         }
 
         static void OnQuitCommandReceived()

com.unity.ml-agents/package.json

 {
   "name": "com.unity.ml-agents",
   "displayName": "ML Agents",
-  "version": "2.0.0-pre.1",
+  "version": "2.0.0-pre.2",
-    "com.unity.barracuda": "1.4.0-preview",
+    "com.unity.barracuda": "2.0.0-pre.2",
     "com.unity.modules.imageconversion": "1.0.0",
     "com.unity.modules.jsonserialize": "1.0.0"
   }

utils/validate_versions.py

             f.write(new_contents)
 
     if csharp_version is not None:
-        package_version = f"{csharp_version}-pre.1"
+        package_version = f"{csharp_version}-pre.2"
         if csharp_extensions_version is not None:
             # since this has never been promoted we need to keep
             # it in preview forever or CI will fail