NEWS and version update

NEWS

+Version 2.0.6 (2019-09-10)
+  o RAdv: Solicited unicast RAs
+  o BGP: Optional Adj-RIB-Out
+  o BGP: Extended optional parameters length
+  o Filter: Sets and set expressions in path masks
+  o Several important bugfixes
+
 Version 2.0.5 (2019-08-01)
   o OSPF Graceful restart (RFC 3623, RFC 5187)
   o BGP: Dynamic BGP

misc/bird.spec

 Summary: BIRD Internet Routing Daemon
 Name: bird
-Version: 2.0.5
+Version: 2.0.6
 Release: 1
 Copyright: GPL
 Group: Networking/Daemons

sysdep/config.h

@@ -13,7 +13,7 @@
 #ifdef GIT_LABEL
 #define BIRD_VERSION XSTR1(GIT_LABEL)
 #else
-#define BIRD_VERSION "2.0.5"
+#define BIRD_VERSION "2.0.6"
 #endif
 
 /* Include parameters determined by configure script */