Document and enforce compatibility with Varnish 4.1.x.

Also document compatibility with more recent RE2 versions.

README.rst

@@ -794,11 +794,10 @@ Example::
 REQUIREMENTS
 ============
 
-The VMOD requires Varnish 4.1.2 or 4.1.3; it is currently not
-compatible with Varnish 5.
+The VMOD requires Varnish 4.1.2 through 4.1.6.
 
 It requires the RE2 library, and has been tested against RE2 versions
-2015-05-01 through 2016-10-01.
+2015-05-01 through 2017-06-01.
 
 INSTALLATION
 ============

configure.ac

 AC_PREREQ(2.59)
 AC_COPYRIGHT([Copyright (c) 2016 UPLEX - Nils Goroll Systemoptimierung])
-AC_INIT([libvmod-re2], [trunk])
+AC_INIT([libvmod-re2], [1.0])
 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)
@@ -66,7 +66,7 @@ AS_VAR_IF([$1], [""], [$5], [$4])dnl
 ])# PKG_CHECK_VAR
 ])
 
-PKG_CHECK_MODULES([libvarnishapi], [varnishapi])
+PKG_CHECK_MODULES([libvarnishapi], [varnishapi >= 4.1.2 varnishapi <= 4.1.6])
 PKG_CHECK_VAR([LIBVARNISHAPI_DATAROOTDIR], [varnishapi], [datarootdir])
 PKG_CHECK_VAR([LIBVARNISHAPI_BINDIR], [varnishapi], [bindir])
 PKG_CHECK_VAR([LIBVARNISHAPI_SBINDIR], [varnishapi], [sbindir])

src/vmod_re2.vcc

@@ -689,11 +689,10 @@ Example::
 REQUIREMENTS
 ============
 
-The VMOD requires Varnish 4.1.2 or 4.1.3; it is currently not
-compatible with Varnish 5.
+The VMOD requires Varnish 4.1.2 through 4.1.6.
 
 It requires the RE2 library, and has been tested against RE2 versions
-2015-05-01 through 2016-10-01.
+2015-05-01 through 2017-06-01.
 
 INSTALLATION
 ============