Update Piwik version in Kalamar

Change-Id: I7ef4280cb299ef9a337b9e9bb9fc6de6e321c059
diff --git a/package.json b/package.json
index df9018c..9abf64d 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
   "name": "Kalamar",
   "description": "Mojolicious-based Frontend for KorAP",
   "license": "BSD-2-Clause",
-  "version": "0.51.3",
+  "version": "0.52.0",
   "pluginVersion": "0.2.2",
   "engines": {
     "node": ">=6.0.0"