Avoid auto-period character after quick type space in Sublime Text 3

FYI: this option may also be called "Add full stop with double-space"

Still at: System Preferences > Text

It's a macOS feature that was added with Sierra

It can be disabled globally via System Preferences -> Keyboard -> Text and unchecking Add period with double-space as per the article instructions.

Quite a handy feature for most things but was driving me to distraction trying to edit .md files!

In addition, you can also disable this with the Terminal by executing:

defaults write NSGlobalDomain NSAutomaticPeriodSubstitutionEnabled -int 0

If you want to enable it, pass 1.