update config

debian/control

@@ -2,7 +2,7 @@ Source: python-gitlabgroups
 Section: python
 Priority: optional
 Maintainer: Jan Kotanski (jkotan) <jankotan@gmail.com> 
-Build-Depends: python (>=2.7), debhelper (>=10.0), dh-python, python3-all, python3-sphinx, python-setuptools, python3-setuptools
+Build-Depends: python3 (>=3), debhelper (>=10.0), dh-python, python3-all, python3-sphinx, python-setuptools, python3-setuptools
 Vcs-browser: https://github.com/jkotan/gitlabgroups/
 Homepage:  https://github.com/jkotan/gitlabgroups/
 Standards-Version: 4.5.0