Problem: 4.2.0 is out, time to bump version for development

Solution: update NEWS, include/zmq.h and packaging

NEWS

+0MQ version 4.2.1 stable, released on 201x/xx/xx
+=============================================
+
+
 0MQ version 4.2.0 stable, released on 2016/11/04
 =============================================
 

include/zmq.h

@@ -41,7 +41,7 @@
 /*  Version macros for compile-time API version detection                     */
 #define ZMQ_VERSION_MAJOR 4
 #define ZMQ_VERSION_MINOR 2
-#define ZMQ_VERSION_PATCH 0
+#define ZMQ_VERSION_PATCH 1
 
 #define ZMQ_MAKE_VERSION(major, minor, patch) \
     ((major) * 10000 + (minor) * 100 + (patch))

packaging/debian/changelog

-zeromq (4.2.0) UNRELEASED; urgency=low
+zeromq (4.2.1) UNRELEASED; urgency=low
 
   * Initial packaging.
 

packaging/debian/zeromq.dsc.obs

@@ -2,7 +2,7 @@ Format: 3.0 (quilt)
 Source: zeromq
 Binary: libzmq5, libzmq3-dev, libzmq5-dbg
 Architecture: any
-Version: 4.2.0
+Version: 4.2.1
 Maintainer: libzmq Developers <zeromq-dev@lists.zeromq.org>
 Homepage: http://www.zeromq.org/
 Standards-Version: 3.9.8

packaging/redhat/zeromq.spec

@@ -10,7 +10,7 @@
 %endif
 %define lib_name libzmq5
 Name:          zeromq
-Version:       4.2.0
+Version:       4.2.1
 Release:       1%{?dist}
 Summary:       The ZeroMQ messaging library
 Group:         Applications/Internet