Bump version to 3.5.0-rc2.

I think it might be time for a release; even if there are still various
unclosed bugs.

CHANGES.md

@@ -1,5 +1,5 @@
-Features added since 3.5.0
-==========================
+Features added in 3.5.0-rc2
+===========================
 
 * `<exec play_pcap_audio="..."/>` and friends:
  - If the argument is not an absolute path, the pcap is searched next
@@ -10,8 +10,10 @@ Features added since 3.5.0
  option. Example: `<exec play_pcap_audio="[file1]"/>` with option
  `-key file1 /path/to/pcap`.
 
+* Various...
 
-Bugs fixed since 3.5.0
-======================
 
-* Example
+Bugs fixed in 3.5.0-rc2
+=======================
+
+* A few...

configure.ac

@@ -1,6 +1,6 @@
 # ======================== initialization ===============================
 
-AC_INIT([SIPp], [3.5.0-rc1], [[email protected]], [sipp])
+AC_INIT([SIPp], [3.5.0-rc2], [[email protected]], [sipp])
 
 # Load non-standard m4 files from ./m4/*.m4.
 # AC_CONFIG_MACRO_DIR([m4]) does not work on pre-1.13 aclocal, so we