Update Piwik version in Kalamar

Change-Id: I7ef4280cb299ef9a337b9e9bb9fc6de6e321c059
diff --git a/lib/Kalamar.pm b/lib/Kalamar.pm
index b4fa1ba..f79c77c 100644
--- a/lib/Kalamar.pm
+++ b/lib/Kalamar.pm
@@ -8,7 +8,7 @@
 use List::Util qw!none uniq!;
 
 # Minor version - may be patched from package.json
-our $VERSION = '0.51';
+our $VERSION = '0.52';
 
 # Supported version of Backend API
 our $API_VERSION = '1.0';