fix bug in wifi connect example

Author: karlsoderby

content/micropython-course/course/07.internet-of-things/01.internet-of-things.md

@@ -36,6 +36,8 @@ Connecting to Wi-Fi® is pretty straightforward concept, and is very similar to
 With MicroPython, we can do it with just a few lines of code, seen in the script below:
 
 ```python
+import network
+
 WIFI_NETWORK='YOUR_NETWORK_NAME'
 WIFI_PASSWORD='YOUR_NETWORK_PASSWORD'