Switch to automatic dependency generator (also fixes #1556164)

- Recommend python37

python-tox.spec

@@ -7,7 +7,7 @@
 %global pypiname tox
 Name:           python-%{pypiname}
 Version:        2.9.1
-Release:        2%{?dist}
+Release:        3%{?dist}
 Summary:        Virtualenv-based automation of test activities
 
 # file toxbootstrap.py is licensed under MIT License
@@ -33,9 +33,6 @@ Summary:        %{summary}
 BuildRequires:  python2-devel
 BuildRequires:  python2-setuptools
 BuildRequires:  python2-setuptools_scm
-Requires:  python2-py
-Requires:  python2-virtualenv >= 1.11.2
-Requires:  python2-pluggy
 
 %if %{with internet}
 # for tests
@@ -44,6 +41,8 @@ BuildRequires:  python2-pytest
 BuildRequires:  python2-virtualenv >= 1.11.2
 %endif
 
+%?python_enable_dependency_generator
+
 %description -n python2-%{pypiname}
 Tox as is a generic virtualenv management and test command line tool you
 can use for:
@@ -65,9 +64,6 @@ Provides:       %{pypiname} = %{version}-%{release}
 BuildRequires:  python3-devel
 BuildRequires:  python3-setuptools
 BuildRequires:  python3-setuptools_scm
-Requires:       python3-py
-Requires:       python3-pluggy
-Requires:       python3-virtualenv
 
 # Recommend "all the Pythons"
 Recommends:     python26
@@ -76,6 +72,7 @@ Recommends:     python33
 Recommends:     python34
 Recommends:     python35
 Recommends:     python36
+Recommends:     python37
 Recommends:     pypy-devel
 Recommends:     pypy3-devel
 Recommends:     python2-devel
@@ -135,6 +132,10 @@ TOXENV=py%{python3_version_nodots} %{__python3} setup.py test
 %{python3_sitelib}/%{pypiname}-%{version}-py%{python3_version}.egg-info
 
 %changelog
+* Thu Mar 15 2018 Miro Hrončok <mhroncok@redhat.com> - 2.9.1-3
+- Switch to automatic dependency generator (also fixes #1556164)
+- Recommend python37
+
 * Fri Feb 09 2018 Fedora Release Engineering <releng@fedoraproject.org> - 2.9.1-2
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_28_Mass_Rebuild