Bugfix release 4.2.1

Finalize changelog and bump ABI revision

CMakeLists.txt

@@ -745,7 +745,7 @@ else ()
                           COMPILE_DEFINITIONS "DLL_EXPORT"
                           PUBLIC_HEADER "${public_headers}"
                           VERSION ${ZMQ_VERSION}
-                          SOVERSION "5.1.0"
+                          SOVERSION "5.1.1"
                           OUTPUT_NAME "libzmq"
                           PREFIX "")
     if (ZMQ_BUILD_FRAMEWORK)

NEWS

-0MQ version 4.2.1 stable, released on 201x/xx/xx
+0MQ version 4.2.1 stable, released on 2016/12/31
 =============================================
 
 * New DRAFT (see NEWS for 4.2.0) Socket Monitor events:

configure.ac

@@ -38,9 +38,10 @@ AC_SUBST(PACKAGE_VERSION)
 # ZeroMQ version 4.0: 4:0:0 (ABI version 4)
 # 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)
 #
 # libzmq -version-info current:revision:age
-LTVER="6:0:1"
+LTVER="6:1:1"
 AC_SUBST(LTVER)
 
 # Take a copy of original flags