update to 4.0

docs/gitbook/gitbook-plugin-livereload/plugin.js

@@ -0,0 +1,11 @@
+(function() {
+  var newEl = document.createElement('script'),
+      firstScriptTag = document.getElementsByTagName('script')[0];
+
+  if (firstScriptTag) {
+    newEl.async = 1;
+    newEl.src = '//' + window.location.hostname + ':35729/livereload.js';
+    firstScriptTag.parentNode.insertBefore(newEl, firstScriptTag);
+  }
+
+})();