docs(cdn): use jsDelivr to have statistics

Author: Johann-S

README.md

@@ -50,8 +50,8 @@ npm install bs-custom-file-input --save
 
 CDN | Link
 ------------ | -------------
-unpkg | [`https://unpkg.com/bs-custom-file-input`](https://unpkg.com/bs-custom-file-input)
-unpkg, minified | [`https://unpkg.com/bs-custom-file-input/dist/bs-custom-file-input.min.js`](https://unpkg.com/bs-custom-file-input/dist/bs-custom-file-input.min.js)
+jsDelivr | [`https://cdn.jsdelivr.net/npm/bs-custom-file-input/dist/bs-custom-file-input.js`](https://cdn.jsdelivr.net/npm/bs-custom-file-input/dist/bs-custom-file-input.js)
+jsDelivr, minified | [`https://cdn.jsdelivr.net/npm/bs-custom-file-input/dist/bs-custom-file-input.min.js`](https://cdn.jsdelivr.net/npm/bs-custom-file-input/dist/bs-custom-file-input.min.js)
 
 ## How to use it
 

demo/index.html

@@ -72,7 +72,7 @@ <h3>Example with label containing a child</h3>
       </div>
     </div>
 
-    <script src="https://unpkg.com/bs-custom-file-input/dist/bs-custom-file-input.min.js"></script>
+    <script src="https://cdn.jsdelivr.net/npm/bs-custom-file-input/dist/bs-custom-file-input.min.js"></script>
     <script>
       document.addEventListener('DOMContentLoaded', function() {
         bsCustomFileInput.init()