Merge pull request #2010 from ably/EDU-207-Add-note-to-MQTT-Python-tutorial-stating-unix-only

Added note to top of Python version of tutorial stating UNIX is supported, not Windows

Author: GregHolmes

content/tutorials/mqtt-snake.textile

@@ -38,6 +38,8 @@ blang[go].
 blang[python].
   h4. The complete source code for each step of "this tutorial is available on Github":https://github.com/ably/tutorials/commits/mqtt-snake-python.
 
+  *Note:* The Python version of this tutorial requires the installation of "Curses":https://docs.python.org/3/howto/curses.html library. However, this library will only work on *Unix-based machines*, not *Windows*.
+
 Ably Realtime provides support for a number of protocols with its pub/sub system, one of which is "MQTT":http://mqtt.org/. MQTT is an open ISO standard providing a lightweight messaging protocol for small sensors and mobile devices, optimized for high-latency or unreliable networks. In most cases we recommend use of the "Ably client library SDKs":https://ably.com/download where you can, due to their far richer feature sets such as presence, automatic encoding and decoding of data types, and much more. However, MQTT can be great for use with languages we don't currently support, as well as when you have stringent bandwidth restrictions or wish to avoid vendor lock-in.
 
 blang[javascript].
@@ -556,4 +558,4 @@ h2. Next steps
 3. Gain a good technical "overview of how the Ably realtime platform works":https://ably.com/docs/key-concepts
 4. "Get in touch if you need help":https://ably.com/contact
 
-h3. Created something cool based on this tutorial? "Tweet it to us!":https://twitter.com/ablyrealtime
+h3. Created something cool based on this tutorial? "Tweet it to us!":https://twitter.com/ablyrealtime