Support integration of Piwik/Matomo in KorAP

Change-Id: I0c67971e67fe83b5c6d8d3dc584fed23c989728b
diff --git a/Makefile.PL b/Makefile.PL
index 03fd375..f85a1bd 100644
--- a/Makefile.PL
+++ b/Makefile.PL
@@ -26,6 +26,7 @@
     'Mojolicious::Plugin::MailException' => 0.20,
     'Mojolicious::Plugin::CHI' => 0.15,
     'Mojolicious::Plugin::ClientIP' => 0.01,
+    'Mojolicious::Plugin::Piwik' => 0.20,
     'Cache::FastMmap' => 0,
     'Mojo::JWT' => 0.05,