Update release number in configure.ac

This to mark the master branch as a work-in-progress, to-be-0.8.0.
diff --git a/configure.ac b/configure.ac
index 982d3f2..f9ff113 100644
--- a/configure.ac
+++ b/configure.ac
@@ -21,9 +21,9 @@
 # 02110-1301 USA
 
 # Process this file with autoconf to produce a configure script.
-AC_PREREQ(2.65)
+AC_PREREQ([2.65])
 
-AC_INIT([ltrace],[0.7.2],[ltrace-devel@lists.alioth.debian.org])
+AC_INIT([ltrace],[0.7.90-git],[ltrace-devel@lists.alioth.debian.org])
 AC_CONFIG_HEADERS([config.h])
 AC_CONFIG_SRCDIR(libltrace.c)
 AC_CONFIG_MACRO_DIR([config/m4])