call transwhat from PATH

When transwhat is installed correctly, distutils should setup $PREFIX/bin/transwhat and $PREFIX/bin/transwhat.py

INSTALL.rst

@@ -69,7 +69,7 @@ following content:
     port = 5221
 
     backend_host = localhost
-    backend = /location/to/transwhat/transwhat.py
+    backend = /usr/bin/transwhat
 
     users_per_backend = 10
     more_resources = 1
@@ -113,4 +113,4 @@ Install required dependencies:
 .. _Spectrum 2: http://www.spectrum.im
 .. _Yowsup 2: https://github.com/tgalal/yowsup
 .. _Github: https://github.com/hanzz/libtransport
-.. _**yowsup**: https://github.com/tgalal/yowsup
+.. _**yowsup**: https://github.com/tgalal/yowsup