Merge pull request #61 from brianbruggeman/master

Removes typing dependency for Python3.5+

Author: syrusakbary

setup.py

@@ -53,6 +53,9 @@
     # PEP-561: https://www.python.org/dev/peps/pep-0561/
     package_data={"promise": ["py.typed"]},
     extras_require={"test": tests_require},
-    install_requires=["typing>=3.6.4", "six"],
+    install_requires=[
+        "typing>=3.6.4; python_version < '3.5'",
+        "six"
+    ],
     tests_require=tests_require,
 )