Update setup.cfg

- specify minimum pystencils version
- remove tests_require

setup.cfg

@@ -30,9 +30,11 @@ package_dir =
 # DON'T CHANGE THE FOLLOWING LINE! IT WILL BE UPDATED BY PYSCAFFOLD!
 setup_requires = pyscaffold>=3.2a0,<3.3a0
 # Add here dependencies of your project (semicolon/line-separated), e.g.
-install_requires = numpy;pystencils>=0.2.6;jinja2
+install_requires =
+    numpy
+    pystencils>=0.2.7
+    jinja2
 # The usage of test_requires is discouraged, see `Dependency Management` docs
-tests_require = pytest;pytest-cov;tensorflow;torch
 # Require a specific Python version, e.g. Python 2.7 or >= 3.4
 # python_requires = >=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*