Enhancement: Add issue note regarding HTTPretty

Author: BenjamenMeyer

README.rst

@@ -92,7 +92,7 @@ You can use any of them, and you must pull them in via your own test requirement
 .. note:: HTTPretty has some version and Python limitations. Version 0.8.6 works fine; however, version 0.9.x which supports
     Python3 seems to have a breaking change that is causing problems. Only 0.8.6 is supported by StackInABox under Python2
     for the time being. That is not to say you may not get it to work; just that the StackInABox Unit Tests cannot verify it
-    will work. PRs are welcome to help resolve this.
+    will work. PRs are welcome to help resolve this. See Issue #80 for status.
 
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