feat: more friendly warning when fetch npm info got error

lib/init_command.js

@@ -1,6 +1,7 @@
 'use strict';
 
 const os = require('os');
+const assert = require('assert');
 const fs = require('fs');
 const path = require('path');
 const rimraf = require('rimraf');
@@ -452,15 +453,17 @@ module.exports = class Command {
    * @return {Object} pkgInfo
    */
   * getPackageInfo(pkgName, withFallback) {
+    this.log(`fetching npm info of ${pkgName}`);
     try {
       const result = yield urllib.request(`${this.registryUrl}/${pkgName}/latest`, {
         dataType: 'json',
         followRedirect: true,
       });
+      assert(result.status === 200, `npm info ${pkgName} got error: ${result.status}, ${result.data.reason}`);
       return result.data;
     } catch (err) {
       if (withFallback) {
-        this.log('use fallback from ${pkgName}');
+        this.log(`use fallback from ${pkgName}`);
         return require(`${pkgName}/package.json`);
       } else {
         throw err;