Add deprecation warning for python 3.5

redbot/__init__.py

@@ -1,5 +1,4 @@
 import sys
-import typing
 import discord
 
 # Let's do all the dumb version checking in one place.
@@ -11,3 +10,12 @@
         " >= 1.0.0."
     )
     sys.exit(1)
+
+if sys.version_info < (3, 6, 0):
+    print(
+        "[DEPRECATION WARNING]\nYou are currently running Python 3.5."
+        " Support for Python 3.5 will end with the release of beta 16."
+        " Please update your environment to Python 3.6 as soon as possible to avoid"
+        " any interruptions after the beta 16 release.",
+        file=sys.stderr,
+    )