Release an emergency 0.4.2

Reverting changes from 0.4.0 and 0.4.1 that will be reintroduced after
better integration tests.

Author: cmaglie

library.properties

@@ -1,5 +1,5 @@
 name=Arduino_ConnectionHandler
-version=0.3.3
+version=0.4.2
 author=Ubi de Feo, Cristian Maglie, Andrea Catozzi, Alexander Entinger et al.
 maintainer=Arduino.cc
 sentence=Arduino Library for network connection management (WiFi, GSM, NB, [Ethernet])