Release version 2.1.0

Merge pull request #9 from tijmenb/add-output-only-flag

Add --output-only

Bump version to 2.0.1

Merge pull request #8 from issyl0/three_dots_not_two

Use three dots not two after the list of 'starting' processes

Add travis.yml file

Expand gem release instructions

Create a changelog

Update .gitignore to exclude gem artefacts

Add gem release instructions to README

Bump gem version

Merge pull request #7 from tijmenb/raise-on-unknown-processes

Raise error when encountering an unknown process

Release v1.2.0