Bump revision up to 0.7.3

ChangeLog

@@ -114,3 +114,8 @@ v0.7.1
 
 v0.7.2
 - Rewrite UnixFd implementation from plain UnixFd struct to full-ownership-semantics UnixFd class
+
+v0.7.3
+- Add ability to integrate with external event loops
+- Add getSenderName() method to Message
+- Skip GetMachineId integration test case when /etc/machine-id is not available