Upped Plack dependency to support localizing $0. Fixes miyagawagh-19

Makefile.PL

@@ -8,13 +8,14 @@ name 'Starman';
 all_from 'lib/Starman.pm';
 readme_from 'lib/Starman.pm';
 build_requires 'Test::More';
-requires 'Plack', 0.9931;
+requires 'Plack', 0.9971;
 requires 'Net::Server', 0.91;
 requires 'Data::Dump';
 requires 'HTTP::Parser::XS';
 requires 'HTTP::Status';
 requires 'HTTP::Date';
 requires 'parent';
+requires 'Test::TCP', 1.11;
 install_script 'bin/starman';
 recommends 'Server::Starter';
 recommends 'Net::Server::SS::PreFork';

t/findbin.psgi

@@ -0,0 +1,6 @@
+use strict;
+use FindBin;
+sub {
+    my $env = shift;
+    return [ 200, [ "Content-Type", "text/plain" ], [ $FindBin::Bin ] ];
+};

t/findbin.t

@@ -0,0 +1,20 @@
+use Test::TCP;
+use LWP::UserAgent;
+use FindBin;
+use Test::More;
+
+my $s = Test::TCP->new(
+    code => sub {
+        my $port = shift;
+        exec "$^X bin/starman --port $port --max-requests=1 --workers=1 $FindBin::Bin/findbin.psgi";
+    },
+);
+
+my $ua = LWP::UserAgent->new;
+
+for (1..2) {
+    my $res = $ua->get("http://localhost:" . $s->port);
+    is $res->content, $FindBin::Bin;
+}
+
+done_testing;