Middleware::Lint rejects OPTIONS * special case

[daxim]

See https://tools.ietf.org/html/rfc7230#section-5.3.4,
https://tools.ietf.org/html/rfc7231#section-4.3.7.

The following patch (untested) restores compliance with the spec.

diff --git a/lib/Plack/Middleware/Lint.pm b/lib/Plack/Middleware/Lint.pm
index eb3deee..be422f5 100644
--- a/lib/Plack/Middleware/Lint.pm
+++ b/lib/Plack/Middleware/Lint.pm
@@ -42,7 +42,10 @@ sub validate_env {
        unless (defined($env->{PATH_INFO})) { # allows empty string
            die('Missing mandatory env param: PATH_INFO');
        }
-    if ($env->{PATH_INFO} ne '' && $env->{PATH_INFO} !~ m!^/!) {
+    if ($env->{PATH_INFO} ne '' && $env->{PATH_INFO} !~ m!^/! &&
+        !($env->{REQUEST_METHOD} eq 'OPTIONS' &&
+          $env->{REQUEST_URI} eq '*')
+    ) {
            die('PATH_INFO must begin with / ($env->{PATH_INFO})');
        }
        unless (defined($env->{SERVER_NAME})) {