Feature Request: Watch the currently open file

[paulhayes]

This is a small feature request. I hope it makes sense.

Ink should watch the currently open file for changes on the filesystem, and throw a prompt informing the user and asking if they want to reload from disk.

This is a feature in a lot of editors and would really help when receiving changes from version control. At the moment you have to manually reopen the file whenever you pull.

by the way Ink is an incredible tool, and I just want to let you know the documentation is fabulous. Well done on developing something so wonderful.