Updated clipboard lib reference and version used

package.json

@@ -33,7 +33,7 @@
     "axios": "^0.16.1",
     "babel-polyfill": "^6.23.0",
     "babel-preset-es2015": "^6.24.1",
-    "clipboard": "^1.5.16",
+    "clipboard": "^1.7.1",
     "codemirror": "^5.26.0",
     "dropzone": "^4.0.1",
     "gulp-util": "^3.0.8",

readme.md

@@ -79,7 +79,7 @@ These are the great open-source projects used to help build BookStack:
 * [jQuery Sortable](https://johnny.github.io/jquery-sortable/)
 * [Material Design Iconic Font](http://zavoloklom.github.io/material-design-iconic-font/icons.html)
 * [Dropzone.js](http://www.dropzonejs.com/)
-* [ZeroClipboard](http://zeroclipboard.org/)
+* [clipboard.js](https://clipboardjs.com/)
 * [TinyColorPicker](http://www.dematte.at/tinyColorPicker/index.html)
 * [markdown-it](https://github.com/markdown-it/markdown-it) and [markdown-it-task-lists](https://github.com/revin/markdown-it-task-lists)
 * [Moment.js](http://momentjs.com/)

resources/assets/js/pages/page-show.js

@@ -1,5 +1,3 @@
-"use strict";
-// Configure ZeroClipboard
 const Clipboard = require("clipboard");
 const Code = require('../code');