<script> tags in README have wrong directory name

[kentr]

Problem

With an installation of HEAD, the source files are going into bower_components/persistence/lib, which has a different path than the examples in README.

Suggested fix

change

<script src="/bower_components/persistencejs/lib/persistence.js"></script>
<script src="/bower_components/persistencejs/lib/persistence.store.sql.js"></script>
<script src="/bower_components/persistencejs/lib/persistence.store.websql.js"></script>

to

<script src="/bower_components/persistence/lib/persistence.js"></script>
<script src="/bower_components/persistence/lib/persistence.store.sql.js"></script>
<script src="/bower_components/persistence/lib/persistence.store.websql.js"></script>