add unpublish.js

unpublish.js

+const fs = require('fs')
+const path = require('path')
+const shellExec = require('shell-exec')
+
+const pkgs = fs.readdirSync(path.resolve(__dirname, 'packages'))
+
+const version = process.argv[2]
+if (!version) {
+  throw new Error('必须传入 version')
+}
+
+(async function() {
+  for (let i = 0; i < pkgs.length; i++) {
+    console.log(`npm unpublish @dcloudio/${pkgs[i]}@${version}`);
+    await shellExec(`npm unpublish @dcloudio/${pkgs[i]}@${version}`)
+  }
+})();