v7.0 release preparation

Author: dl8dtl

src/configure.ac

@@ -23,7 +23,7 @@
 # Process this file with autoconf to produce a configure script.
 
 AC_PREREQ(2.60)
-AC_INIT(avrdude, 6.99-20211218, avrdude-dev@nongnu.org)
+AC_INIT(avrdude, 7.0, avrdude-dev@nongnu.org)
 
 AC_CANONICAL_BUILD
 AC_CANONICAL_HOST