Update changelog to add WebSocket. As it is a new spec I added it to the beginning of the changelog. I'll so the same for Servlet 3.1, EL 3.0 and JSP 2.3 when they are implemented.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1457993 13f79535-47bb-0310-9956-ffa450edef68
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git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1458023 13f79535-47bb-0310-9956-ffa450edef68