[V3] Actually add compatibility with 3.5.1 (#1155)

* Fix 3.5.1 issue with TYPE_CHECKING

* I hate you

* Smarter...

redbot/core/utils/__init__.py

@@ -0,0 +1,12 @@
+__all__ = ['TYPE_CHECKING', 'NewType']
+
+try:
+    from typing import TYPE_CHECKING
+except ImportError:
+    TYPE_CHECKING = False
+
+try:
+    from typing import NewType
+except ImportError:
+    def NewType(name, tp):
+        return type(name, (tp,), {})