Update dependency for Piwik plugin

Change-Id: Ic3b2b43fc681402917f9d6268cfadd395cc968a1
diff --git a/Makefile.PL b/Makefile.PL
index 3768bdd..d03e5fc 100644
--- a/Makefile.PL
+++ b/Makefile.PL
@@ -27,7 +27,7 @@
     'Mojo::JWT' => 0.05,
 
     # Required for bundled plugins
-    'Mojolicious::Plugin::Piwik' => 0.25,
+    'Mojolicious::Plugin::Piwik' => 0.26,
 
     # Currently on GitHub only (github.com/akron)
     'Mojolicious::Plugin::Localize' => 0.20,