Update version for release 4 (master) (#4207)

* Update version for release 4

* newline in json file

* actually fix newline

Co-authored-by: Chris Elion <chris.elion@unity3d.com>

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 = "1.1.0-preview";
+        internal const string k_PackageVersion = "1.2.0-preview";
 
         const int k_EditorTrainingPort = 5004;
 

com.unity.ml-agents/package.json

 {
   "name": "com.unity.ml-agents",
   "displayName": "ML Agents",
-  "version": "1.1.0-preview",
+  "version": "1.2.0-preview",
   "unity": "2018.4",
   "description": "Use state-of-the-art machine learning to create intelligent character behaviors in any Unity environment (games, robotics, film, etc.).",
   "dependencies": {

gym-unity/gym_unity/__init__.py

 # Version of the library that will be used to upload to pypi
-__version__ = "0.18.0.dev0"
+__version__ = "0.19.0.dev0"
 
 # Git tag that will be checked to determine whether to trigger upload to pypi
 __release_tag__ = None

ml-agents-envs/mlagents_envs/__init__.py

 # Version of the library that will be used to upload to pypi
-__version__ = "0.18.0.dev0"
+__version__ = "0.19.0.dev0"
 
 # Git tag that will be checked to determine whether to trigger upload to pypi
 __release_tag__ = None

ml-agents/mlagents/trainers/__init__.py

 # Version of the library that will be used to upload to pypi
-__version__ = "0.18.0.dev0"
+__version__ = "0.19.0.dev0"
 
 # Git tag that will be checked to determine whether to trigger upload to pypi
 __release_tag__ = None

utils/validate_versions.py

         package_json["version"] = new_version
     with open(UNITY_PACKAGE_JSON_PATH, "w") as f:
         json.dump(package_json, f, indent=2)
+        f.write("\n")
 
 
 def set_academy_version_string(new_version):