Support CSP in Matomo/Piwik plugin

Change-Id: Ie80c6ffca714460c310e2b55ad9b3b63f5ae71ad
diff --git a/Makefile.PL b/Makefile.PL
index d2dca03..8aaee56 100644
--- a/Makefile.PL
+++ b/Makefile.PL
@@ -33,7 +33,7 @@
     'JSON' => 4.02,
 
     # Required for bundled plugins
-    'Mojolicious::Plugin::Piwik' => 0.26,
+    'Mojolicious::Plugin::Piwik' => 0.28,
 
     # Currently on GitHub only (github.com/akron)
     'Mojolicious::Plugin::Localize' => 0.20,