Final changes for v2.5.7 patch release

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

Author: troglobit

ChangeLog.md

@@ -656,7 +656,8 @@ Initial public release by Carsten Schill.
 
 [mrdisc]:     https://github.com/troglobit/mrdisc
 [RFC4286]:    https://tools.ietf.org/html/rfc4286
-[UNRELEASED]: https://github.com/troglobit/smcroute/compare/2.5.6...HEAD
+[UNRELEASED]: https://github.com/troglobit/smcroute/compare/2.5.7...HEAD
+[v2.5.7]:     https://github.com/troglobit/smcroute/compare/2.5.6...2.5.7
 [v2.5.6]:     https://github.com/troglobit/smcroute/compare/2.5.5...2.5.6
 [v2.5.5]:     https://github.com/troglobit/smcroute/compare/2.5.4...2.5.5
 [v2.5.4]:     https://github.com/troglobit/smcroute/compare/2.5.3...2.5.4

configure.ac

@@ -2,7 +2,7 @@
 # Process this file with autoconf to produce a configure script.
 
 AC_PREREQ(2.61)
-AC_INIT([SMCRoute], [2.5.6], [https://github.com/troglobit/smcroute/issues],
+AC_INIT([SMCRoute], [2.5.7], [https://github.com/troglobit/smcroute/issues],
 	 [smcroute], [https://troglobit.com/smcroute.html])
 AC_CONFIG_AUX_DIR(aux)
 AM_INIT_AUTOMAKE([1.11 foreign])