Update README.md

don't use -g, especially not before 'install'
Merge branch 'develop' of ssh://github.com/colab-coop/colab-coop into develop
Merge branch 'develop' of ssh://github.com/colab-coop/colab-coop into develop
Merge branch 'develop' of ssh://github.com/colab-coop/colab-coop into develop
Merge branch 'develop' of ssh://github.com/colab-coop/colab-coop into develop
Merge branch 'develop' of ssh://github.com/colab-coop/colab-coop into develop
Merge branch 'develop' of ssh://github.com/colab-coop/colab-coop into develop
Merge branch 'develop' of ssh://github.com/colab-coop/colab-coop into develop
Merge branch 'develop' of ssh://github.com/colab-coop/colab-coop into develop
Merge branch 'develop' of ssh://github.com/colab-coop/colab-coop into develop
Merge branch 'develop' of ssh://github.com/colab-coop/colab-coop into develop
Merge branch 'develop' of ssh://github.com/colab-coop/colab-coop into develop
Merge branch 'develop' of ssh://github.com/colab-coop/colab-coop into develop
Merge branch 'develop' of ssh://github.com/colab-coop/colab-coop into develop
Merge branch 'develop' of ssh://github.com/colab-coop/colab-coop into develop
Merge branch 'develop' of ssh://github.com/colab-coop/colab-coop into develop
Merge branch 'develop' of ssh://github.com/colab-coop/colab-coop into develop
Merge branch 'develop' of ssh://github.com/colab-coop/colab-coop into develop
Merge branch 'develop' of ssh://github.com/colab-coop/colab-coop into develop
Merge branch 'develop' of ssh://github.com/colab-coop/colab-coop into develop