oop, forgot the micro v number

configure.ac didn't set micro

Author: jcupitt

configure.ac

@@ -1,6 +1,6 @@
 # Process this file with autoconf to produce a configure script.
 
-AC_INIT([nip2], [8.5], [vipsip@jiscmail.ac.uk])
+AC_INIT([nip2], [8.5.1], [vipsip@jiscmail.ac.uk])
 
 # foreign stops complaints about a missing README (we use README.md instead)
 # and missing INSTALL (the standard Gnu INSTALL is not very useful)