Problem: 4.2.1 is out, time to bump versions

Solution: add new changelog entry, bump library version in zmq.h and
bump ABI version in configure.ac and CMakeLists.txt

CMakeLists.txt

@@ -745,7 +745,7 @@ else ()
                           COMPILE_DEFINITIONS "DLL_EXPORT"
                           PUBLIC_HEADER "${public_headers}"
                           VERSION ${ZMQ_VERSION}
-                          SOVERSION "5.1.1"
+                          SOVERSION "5.1.2"
                           OUTPUT_NAME "libzmq"
                           PREFIX "")
     if (ZMQ_BUILD_FRAMEWORK)

NEWS

+0MQ version 4.2.2 stable, released on 20xx/xx/xx
+=============================================
+
+
 0MQ version 4.2.1 stable, released on 2016/12/31
 =============================================
 

configure.ac

@@ -39,9 +39,10 @@ AC_SUBST(PACKAGE_VERSION)
 # ZeroMQ version 4.1: 5:0:0 (ABI version 5)
 # ZeroMQ version 4.2.0: 6:0:1 (ABI version 5)
 # ZeroMQ version 4.2.1: 6:1:1 (ABI version 5)
+# ZeroMQ version 4.2.2: 6:2:1 (ABI version 5)
 #
 # libzmq -version-info current:revision:age
-LTVER="6:1:1"
+LTVER="6:2:1"
 AC_SUBST(LTVER)
 
 # Take a copy of original flags

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 1
+#define ZMQ_VERSION_PATCH 2
 
 #define ZMQ_MAKE_VERSION(major, minor, patch) \
     ((major) * 10000 + (minor) * 100 + (patch))