update to book 3

book.json

@@ -1,7 +1,7 @@
 {
   "title": "Krestianstvo SDK",
   "description": "Virtual world on Windows / Mac",
-  "gitbook": "2.x.x",
+  "gitbook": "3.0.0-pre.9",
   "plugins": ["ga"],
     "pluginsConfig": {
       "ga": {