Update unpkg link in README

Author: foxbenjaminfox

README.md

@@ -102,7 +102,7 @@ Alternately, you can link it directly from a CDN:
   That will always point to the latest version of vue-async-computed.
   You probably want to instead pin it to a specific version:
 -->
-<script src="https://unpkg.com/%3Ca%20href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="2f595a4a024e5c56414c024c40425f5a5b4a4b6f1c011e">[email protected].0"></script>
+<script src="https://unpkg.com/%3Ca%20href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="e4929181c985979d8a87c9878b899491908180a4d7cad5">[email protected].3"></script>
 ````
 
 When used with a module system such as `webpack` or `browserify`, you need to explicitly install `vue-async-computed` via `Vue.use()`: