Merge pull request #1003 from DeterminateSystems/perlcritic-level-4

perlcritic: level 4

src/script/hydra-notify

@@ -1,6 +1,7 @@
 #! /usr/bin/env perl
 
 use strict;
+use warnings;
 use utf8;
 use Getopt::Long;
 use HTTP::Server::PSGI;