Colon (:) in filename breaks for Windows

[phillipjohnston]

I normally work on Linux and macOS, so this doesn't normally matter to me. But one of my users reported that they had troubles using my projects because the project history notes all have colons in the name, which is an invalid character on Windows.

Example:

2020-11-06T16:42:42Z_note_jQkqMf8gkhRMoi4R.md