Try with rawgit

Author: HollyPony

docs/_layouts/default.html

@@ -62,7 +62,7 @@ <h2 id="project_tagline">{{ site.description | default: site.github.project_tagl
 {% endif %}
 
 <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.4/angular.min.js"></script>
-<script src="https://raw.githubusercontent.com/heyprof/angularjs-input-birthday/master/dist/angularjs-input-birthday.js"></script>
+<script src="https://rawgit.com/heyprof/angularjs-input-birthday/master/dist/angularjs-input-birthday.js"></script>
 <script src="/angularjs-input-file/js/app.js"></script>
 </body>
 </html>