upgraded to SpatialOS 10.4.0

Author: johnprobable

spatialos.json

@@ -1,8 +1,8 @@
 {
     "name": "your_project_name_here",
     "project_version": "1.0.0",
-    "sdk_version": "10.3.3",
+    "sdk_version": "10.4.0",
     "dependencies": [
-    	{"name": "WorkerSdkSchema", "version": "10.3.3"}
+    	{"name": "WorkerSdkSchema", "version": "10.4.0"}
     ]
 }