Set the installed version for this project.

    Args:
        vcs (easyci.vcs.base.Vcs)
        version (str)

def set_installed_version(vcs, version):
    """Set the installed version for this project.

    Args:
        vcs (easyci.vcs.base.Vcs)
        version (str)
    """
    version_path = _get_version_path(vcs)
    with open(version_path, 'w') as f:
        f.write(version)