Prepare for 4.7 release

* configure.ac: Version 4.7.
* debian/changelog: 4.7-1.
* strace.spec: 4.7-1.
diff --git a/configure.ac b/configure.ac
index 82c8e87..4107bfa 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,6 +1,6 @@
 dnl Process this file with autoconf to create configure.  Use autoreconf.
 AC_PREREQ(2.57)
-AC_INIT([strace],[4.6])
+AC_INIT([strace],[4.7])
 AC_CONFIG_SRCDIR([strace.c])
 AC_CONFIG_AUX_DIR([.])
 AM_CONFIG_HEADER([config.h])