Set absolute import mode for the providers module and add types module test

src/dependency_injector/providers.pyx

@@ -3,6 +3,8 @@
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 """
 
+from __future__ import absolute_import
+
 import copy
 import os
 import re

tests/unit/providers/test_types_py35.py

@@ -0,0 +1,15 @@
+import unittest
+
+from dependency_injector import providers, types
+
+
+class SomeClass:
+    ...
+
+
+class TypesTest(unittest.TestCase):
+
+    def test_provider(self):
+        provider: types.Provider[SomeClass] = providers.Factory(SomeClass)
+        some_object = provider()
+        self.assertIsInstance(some_object, SomeClass)