Cannot install when there's already symfony/console 3.x installed

[lesaff]

Getting this error message from my composer during installation

Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - Installation request for schickling/git-s3 dev-master -> satisfiable by schickling/git-s3[dev-master].
    - Conclusion: remove symfony/console v3.1.2
    - Conclusion: don't install symfony/console v3.1.2
    - schickling/git-s3 dev-master requires symfony/console 2.*