Don't use pkg_resources to declare namespace - prefer pkgutil

beat/__init__.py

@@ -25,5 +25,6 @@
 #                                                                             #
 ###############################################################################
 
-#see http://peak.telecommunity.com/DevCenter/setuptools#namespace-packages
-__import__('pkg_resources').declare_namespace(__name__)
+# see https://docs.python.org/3/library/pkgutil.html
+from pkgutil import extend_path
+__path__ = extend_path(__path__, __name__)