chore(gitbook): update gitbook and its deps

Author: jayphelps

book.json

@@ -1,5 +1,5 @@
 {
-  "gitbook": "^3.0.0",
+  "gitbook": "^3.1.1",
   "title": "redux-observable",
   "plugins": ["edit-link", "prism", "github", "anker-enable", "addcssjs"],
   "pluginsConfig": {

package.json

@@ -79,12 +79,12 @@
     "cross-env": "^2.0.0",
     "eslint": "^3.2.2",
     "gitbook-cli": "^2.3.0",
-    "gitbook-plugin-addcssjs": "1.0.2",
-    "gitbook-plugin-anker-enable": "0.0.4",
-    "gitbook-plugin-edit-link": "2.0.2",
-    "gitbook-plugin-github": "2.0.0",
-    "gitbook-plugin-prism": "1.1.0",
-    "gitbook-plugin-theme-default": "1.0.5",
+    "gitbook-plugin-addcssjs": "^1.0.2",
+    "gitbook-plugin-anker-enable": "^0.0.4",
+    "gitbook-plugin-edit-link": "^2.0.2",
+    "gitbook-plugin-github": "^2.0.0",
+    "gitbook-plugin-prism": "^1.1.0",
+    "gitbook-plugin-theme-default": "^1.0.5",
     "json-server": "^0.8.17",
     "mocha": "^3.0.1",
     "redux": "^3.5.2",

website/script.js

@@ -1,7 +1,6 @@
 window.gitbook = window.gitbook || [];
 
 gitbook.push(function () {
-
   gitbook.events.on('page.change', function () {
     // We use a slightly different styling so that
     // the normal window scrollbar is used, so we need