Adding instructions in README for installing packages on newer micropython builds.

README.md

@@ -18,4 +18,18 @@ import upip
 upip.install('umqtt.simple')
 upip.install('umqtt.robust')
 ```
+
+for later versions of MicroPython, you should use `mip` instead...
+
+```
+import network
+wlan = network.WLAN(network.STA_IF)
+wlan.active(True)
+wlan.connect("Wi-Fi AP", "PASSWORD")
+
+import mip
+mip.install('umqtt.simple')
+mip.install('umqtt.robust')
+```
+
 - Upload files onto PICO, adjust params (such as Wi-Fi Credentials // pins // etc ), deploy to your PICO W