Add unofficial status

Author: mottosso

README.md

@@ -1,7 +1,11 @@
-### PyQt5 for Windows and 64-bit Python 2.7
+### Unofficial PyQt5 via PyPI for Python 2.7 64-bit on Windows
 
 [![Build status](https://ci.appveyor.com/api/projects/status/wfp7ximk4janf9yj?svg=true)](https://ci.appveyor.com/project/mottosso/python-qt5) [![PyPI version][pypi]][pypi_repo]
 
+# Heads up! This project *may* be removed from PyPI
+
+..in favour of the official distribution exclusively for Python 3+. See #32 for details and let us know if you have any issues with it.
+
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