Set version 1.4.5.

Backports the bugfix for the off-by-one error in rewrites for
compatibility with Varnish 5.2.

configure.ac

 AC_PREREQ(2.59)
 AC_COPYRIGHT([Copyright (c) 2016 UPLEX - Nils Goroll Systemoptimierung])
-AC_INIT([libvmod-re2], [1.4.3], [varnish-support@uplex.de], [vmod-re2])
+AC_INIT([libvmod-re2], [1.4.5], [varnish-support@uplex.de], [vmod-re2])
 AC_CONFIG_MACRO_DIR([m4])
 m4_ifndef([VARNISH_VMOD_INCLUDES], AC_MSG_ERROR([Need varnish.m4 -- see README.rst]))
 AC_CONFIG_SRCDIR(src/vmod_re2.vcc)