manage shrinkwrap for npm

package.json

@@ -8,7 +8,8 @@
     "pretest": "npm run lint",
     "start": "node bin/io-bot",
     "demo": "node example/ding-dong-bot.js",
-    "prepublish": "npm shrinkwrap",
+    "prepublish": "in-publish && npm shrinkwrap || in-install",
+    "postpublish": "rimraf npm-shrinkwrap.json",
     "test": "cross-env TAP_TIMEOUT=600 tap --reporter=tap test/**/*.spec.js"
   },
   "repository": {
@@ -66,6 +67,7 @@
     "cross-env": "latest",
     "eslint": "latest",
     "qrcode-terminal": "latest",
+    "rimraf": "latest",
     "tap": "latest",
     "tuling123-client": "latest"
   },