Update barracuda, swtich Agents in Sorter use Burst. (#4979) (#4981)

Author: surfnerd

com.unity.ml-agents/package.json

@@ -5,7 +5,7 @@
   "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": {
-    "com.unity.barracuda": "1.3.0-preview",
+    "com.unity.barracuda": "1.3.1-preview",
     "com.unity.modules.imageconversion": "1.0.0",
     "com.unity.modules.jsonserialize": "1.0.0",
     "com.unity.modules.physics": "1.0.0",