Added a note on python hanging issue on Windows

[anenadic]

Fixes #175.

[steve-crouch]

Might want to consider working the 'Making sure...' callout into the main text itself, since a callout is sometimes seen as optional - if they choose not to do it, and later encounter the Python invocation problem, they may miss the handy link to the resolution in the callout.

[anenadic]

Might want to consider working the 'Making sure...' callout into the main text itself, since a callout is sometimes seen as optional - if they choose not to do it, and later encounter the Python invocation problem, they may miss the handy link to the resolution in the callout.

I wanted to make it visually distinctive so it is not missed in the large body of text - how about I use the .prereq block instead?

Fixed via 8dedd54.

[steve-crouch]

Yep, that's a good way to highlight it.