Update Changelog

Bump version to 0.3.1

Update deps

Raise if no Monitor process running

Update README.md: Change base directory in example

Update ex_doc to 0.36

Add more tests

Update README.md (#27)

Update README.md

Update README.md

Update README.md

Remove confusing part from README.md

Sleep more in test

Extend changelog

Improve moduledoc in Tmp.Worker