Update package version 3.0.0-exp.1

Author: judubu

package/com.unity.formats.usd/CHANGELOG.md

@@ -1,6 +1,6 @@
 # Changes in usd-unitysdk for Unity
 
-## Unreleased
+## [3.0.0-exp.1] - 2021-06-15
 ### Features
 - New Import/Export API. See the ImportHelpers and ExportHelpers class (#237).
 - Added Integration with Recorder (compatible with Recorder 2.2.0 or newer) (#243).

package/com.unity.formats.usd/package.json

@@ -30,5 +30,5 @@
         "url": "ssh://git@github.com:Unity-Technologies/usd-unity-sdk.git"
     },
     "unity": "2019.4",
-    "version": "2.0.0-exp.1"
+    "version": "3.0.0-exp.1"
 }