chore(package): update primus to version 6.0.2

Author: greenkeeperio-bot

package.json

@@ -46,7 +46,7 @@
   "dependencies": {
     "debug": "^2.2.0",
     "feathers-socket-commons": "^2.0.0",
-    "primus": "^5.0.1",
+    "primus": "^6.0.2",
     "primus-emitter": "^3.1.1",
     "uberproto": "^1.2.0"
   },