Limit installation to Py3 versions

Author: alvarolopez

requirements.txt

@@ -1,7 +1,7 @@
 # The order of packages is significant, because pip processes them in the order
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
-pbr>=1.8
+pbr>=4.1.0
 six>=1.9.0 # MIT
 
 oslo.log>=1.8.0 # Apache-2.0

setup.cfg

@@ -12,6 +12,8 @@ project_urls =
     Bug Tracker = https://github.com/indigo-dc/deepaas/issues
     Documentation = https://deepaas.readthedocs.io/
 
+python-requires = >=3.6
+
 license = Apache-2
 license_file = LICENSE
 
@@ -37,9 +39,6 @@ classifier =
     Topic :: Scientific/Engineering :: Information Analysis
     Topic :: Scientific/Engineering :: Interface Engine/Protocol Translator
 
-[bdist_wheel]
-universal = 1
-
 [files]
 packages =
     deepaas