add deprecation.js to web-animations.html. Fixes #254

Author: nevir

web-animations.html

@@ -21,6 +21,7 @@
 
 <script src="src/dev.js"></script>
 <script src="src/scope.js"></script>
+<script src="src/deprecation.js"></script>
 <script src="src/timing-utilities.js"></script>
 <script src="src/normalize-keyframes.js"></script>
 <script src="src/animation-node.js"></script>