Minor changes in version and remove email

Author: sleipnir

requirements.txt

@@ -1,5 +1,6 @@
 attrs==19.3.0
 google-api==0.1.12
+googleapis-common-protos >= 1.51.0
 grpcio==1.28.1
 grpcio-tools==1.28.1
 protobuf==3.11.3

setup.cfg

@@ -1,15 +1,14 @@
 [metadata]
 url = https://cloudstate.io/
 author = Cloudstate
-#author_email = sleipnir@bsd.com.br
 license = Apache
 license_file = LICENSE
 classifiers =
     Intended Audience :: Developers
     License :: OSI Approved :: Apache Version 2
     Operating System :: OS Independent
     Programming Language :: Python
-    Programming Language :: Python :: 3.8
+    Programming Language :: Python :: 3.6
 project_urls =
     Documentation = https://cloudstate.io/docs/user/lang/index.html
     Source = https://github.com/cloudstateio/python-support