Add information on secret file to readme

Change-Id: I22148257c9307cb5474d798d2f826f7f2752cc5a
diff --git a/lib/Kalamar.pm b/lib/Kalamar.pm
index 6f83103..12ed96c 100644
--- a/lib/Kalamar.pm
+++ b/lib/Kalamar.pm
@@ -8,7 +8,7 @@
 use List::Util 'none';
 
 # Minor version - may be patched from package.json
-our $VERSION = '0.38';
+our $VERSION = '0.39';
 
 # Supported version of Backend API
 our $API_VERSION = '1.0';