Upgrading txrudp to 0.5.1 in requirements.txt

Author: Sam Patterson

requirements.txt

@@ -1,6 +1,6 @@
 protobuf==2.6.1
 Twisted==14.0.2
-txrudp==0.5.0
+txrudp==0.5.1
 pystun==0.1.0
 bitcoin==1.1.36
 gnupg==2.0.2
@@ -12,4 +12,4 @@ python-libbitcoinclient==0.3.2
 requests==2.7.0
 pyopenssl==0.15.1
 miniupnpc==1.9
-service_identity
+service_identity