Updated cli-setup.md

Author: Cruz Monrreal

docs/tools/offline/cli-setup.md

@@ -7,7 +7,7 @@ You can install Mbed CLI on Windows, Linux and Mac OS X.
 ## Requirements
 
 - **Python:** Mbed CLI is a Python script, so you'll need Python to use it:
-    - We test Mbed CLI with [version 2.7.11 of Python](https://www.python.org/downloads/release/python-2711/). It is not compatible with Python 3.
+    - We test Mbed CLI with [Python versions 2.7.12+ and 3.6.5+](https://www.python.org/downloads/).
     - pip.
 
 - **Git and Mercurial:** Mbed CLI supports both Git and Mercurial repositories, and you may need libraries from both sources as you work, so please to install both: