update eventemmiter3 to 3.1.0 to support index.d.ts

package.json

@@ -48,7 +48,7 @@
   "dependencies": {
     "@types/node": "^10.12.0",
     "@types/webrtc": "0.0.24",
-    "eventemitter3": "^0.1.6",
+    "eventemitter3": "^3.1.0",
     "js-binarypack": "0.0.9",
     "opencollective": "^1.0.3",
     "opencollective-postinstall": "^2.0.0",