Bump version to 1.3.1

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "peerjs",
-  "version": "1.3.0",
+  "version": "1.3.1",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {

package.json

@@ -1,6 +1,6 @@
 {
   "name": "peerjs",
-  "version": "1.3.0",
+  "version": "1.3.1",
   "description": "PeerJS client",
   "main": "./dist/peerjs.min.js",
   "homepage": "https://github.com/peers/peerjs#readme",