Launching many instances of the linter

[lupont]

Without setting lint-debounce in the config file, EFM seems to keep launching instances of the linter when updating a text document. In my case, I'm using neovim with the flake8 linter, and it kept happening when updating the document in insert mode.

Just by adding lint-debounce in my config.yaml the issue seems resolved. Maybe there could be a short comment in the README explaining to do this, or at least that there seems to be no default?

Great program, I admire the work you've put into this :)