Convert README to .rst for PyPI.
diff --git a/setup.cfg b/setup.cfg
index c68c02d..360d7aa 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -3,5 +3,5 @@
 author_email = phil@gadgetoid.com
 url = https://github.com/WiringPi/WiringPi-Python/
 description = A python interface to WiringPi 2.0 library which allows for easily interfacing with the GPIO pins of the Raspberry Pi. Also supports i2c and SPI.
-long_description = file:README.md
+long_description = file:README.rst
 license = LGPL