remove uneeded Net::DNS dependency

Netdisco/lib/Netdisco/Web/Search.pm

@@ -7,7 +7,6 @@ use Dancer::Plugin::DBIC;
 use NetAddr::IP::Lite ':lower';
 use Net::MAC ();
 use List::MoreUtils ();
-use Net::DNS ();
 
 hook 'before' => sub {
     # view settings for node options

README.pod

@@ -47,7 +47,6 @@ install Perl dependencies into a custom library path:
      namespace::clean \
      Moo \
      List::MoreUtils \
-     Net::DNS \
      Socket6 \
      HTML::Entities \
      Template::Toolkit \