enable TOC for gitbook 3.0.0

tennix · tennix · commit 9fd1ba8864dd · 2016-05-26T10:10:44.000+08:00
diff --git a/book.json b/book.json
@@ -1,3 +1,8 @@
 {
-    "lang":"zh-cn"
+    "lang":"zh-cn",
+    "pluginsConfig": {
+	"theme-default": {
+	    "showLevel": true
+	}
+    }
 }
