bump version to 1.6.0-rc2

NEWS

+Knot DNS 1.6.0-rc2 (2014-10-17)
+===============================
+
+Improvements:
+-------------
+ - Maximal size of persistent timers database increased from 10 MB to 100 MB
+ - Added logging of persistent timers database errors
+
+Bugfixes:
+---------
+ - Persistent timers database opening after privileges has been dropped
+
 Knot DNS 1.6.0-rc1 (2014-10-13)
 ===============================
 
@@ -6,7 +18,7 @@ Features:
  - Persistent timers for slave zones (expire, refresh, and flush)
 
 Bugfixes:
---------
+---------
  - DNSSEC: RFC compliant processing of letter case in RDATA domain names
  - EDNS: Return minimal error response for queries with unsupported version
  - EDNS: Fix interpretation of Extended RCODE

configure.ac

 #                                               -*- Autoconf -*-
 
 AC_PREREQ([2.60])
-AC_INIT([knot], [1.6.0-rc1], [knot-dns@labs.nic.cz])
+AC_INIT([knot], [1.6.0-rc2], [knot-dns@labs.nic.cz])
 AM_INIT_AUTOMAKE([gnits subdir-objects dist-xz -Wall -Werror])
 AM_SILENT_RULES([yes])
 AC_CONFIG_SRCDIR([src/knot/main.c])