update to version 1.6.0rc1

* added REST proxy client implementing the DHT API
* added optional support for push notifications through the proxy server,
  using the gorush REST API: https://github.com/appleboy/gorush#web-api
* DhtRunner: now able to use DhtProxyClient as a DHT node
* DhtRunner: can switch between local or proxy node during runtime
* SockAddr: added methods to handle IPv6-mapped IPv4 addresses
* iOS: handle SIGPIPE on UDP sockets by recreating sockets
* fixed occasional crash during packet processing

CMakeLists.txt

 cmake_minimum_required (VERSION 3.1)
 project (opendht)
 set (opendht_VERSION_MAJOR 1)
-set (opendht_VERSION_MINOR 5.0)
+set (opendht_VERSION_MINOR 6.0)
 set (opendht_VERSION ${opendht_VERSION_MAJOR}.${opendht_VERSION_MINOR})
 set (PACKAGE_VERSION ${opendht_VERSION})
 set (VERSION "${opendht_VERSION}")

configure.ac

 dnl define macros
 m4_define([opendht_major_version], 1)
-m4_define([opendht_minor_version], 5)
+m4_define([opendht_minor_version], 6)
 m4_define([opendht_patch_version], 0)
 m4_define([opendht_version],
 		  [opendht_major_version.opendht_minor_version.opendht_patch_version])