fix(types): new ws typing fix

package-lock.json

 {
   "name": "wechaty",
-  "version": "0.8.93",
+  "version": "0.8.94",
   "lockfileVersion": 1,
   "dependencies": {
     "@ava/babel-preset-stage-4": {
@@ -94,9 +94,9 @@
       "dev": true
     },
     "@types/ws": {
-      "version": "0.0.41",
-      "resolved": "https://registry.npmjs.org/@types/ws/-/ws-0.0.41.tgz",
-      "integrity": "sha1-iKfgzRYFvW6ncxEJVGcTlMaQ2xo=",
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/@types/ws/-/ws-3.0.0.tgz",
+      "integrity": "sha512-izHR5cQvRE6nG828CkNd3pOCIjwZ/poOhxeeLyBWyRoXBDZ2qSA7iEHwp7XFnq7seJk9APpm8iJBau4fAhDY0Q==",
       "dev": true
     },
     "accepts": {

src/io.ts

@@ -144,11 +144,15 @@ export class Io {
 
     })
 
-    ws.on('message', (data, flags) => {
+    ws.on('message', data => {
       log.silly('Io', 'initWebSocket() ws.on(message): %s', data)
       // flags.binary will be set if a binary data is received.
       // flags.masked will be set if the data was masked.
 
+      if (typeof data !== 'string') {
+        throw new Error('data should be string...')
+      }
+
       const ioEvent: IoEvent = {
         name: 'raw',
         payload: data,