Merge pull request #1480 from Unity-Technologies/Fix-issue-with-HDRP-version

changeHDRPVersion to integer and don't display warning

com.unity.render-pipelines.high-definition/HDRP/Editor/Upgraders/HDRPVersion.cs

     [InitializeOnLoad]
     public class HDRPVersion
     {
-        static public float hdrpVersion = 1.0f;
+        static public int hdrpVersion = 1;
-        static public float GetCurrentHDRPProjectVersion()
+        static public int GetCurrentHDRPProjectVersion()
-            version[0] = "0.9"; // Note: When we don't know what a project is, assume worst case
+            version[0] = "0"; // Note: When we don't know what a project is, assume worst case 0
 
             try
             {
             {
-                Debug.LogWarning("Unable to read from ProjectSettings/HDRPProjectVersion.txt - Assign default version value");
+                // Don't display warning
+                //Debug.LogWarning("Unable to read from ProjectSettings/HDRPProjectVersion.txt - Assign default version value");
-            return float.Parse(version[0]);
+            return int.Parse(version[0]);
         }
 
         static public void WriteCurrentHDRPProjectVersion()