Update 00.cover.ipynb

huoju has changed his url

Author: mrguangtu

00.cover.ipynb

@@ -15,7 +15,7 @@
    "source": [
     "**作者：李笑来**\n",
     "\n",
-    "特别感谢**霍炬**（[@virushuo](https://github.com/virushuo)）、**洪强宁**（[@hongqn](https://github.com/hongqn)) 两位良师诤友在此书写作过程中给予我的巨大帮助！\n",
+    "特别感谢**霍炬**（[@virushuo](https://github.com/huo-ju)）、**洪强宁**（[@hongqn](https://github.com/hongqn)) 两位良师诤友在此书写作过程中给予我的巨大帮助！\n",
     "\n",
     "```python\n",
     "# pseudo-code of selfteaching in Python\n",