update README to reflect ASF license.

README.markdown

@@ -41,12 +41,23 @@ You can also come to the #storm-user room on [freenode](http://freenode.net/). Y
 
 ## License
 
-The use and distribution terms for this software are covered by the
-Eclipse Public License 1.0 (http://opensource.org/licenses/eclipse-1.0.php)
-which can be found in the file LICENSE.html at the root of this distribution.
-By using this software in any fashion, you are agreeing to be bound by
-the terms of this license.
-You must not remove this notice, or any other, from this software.
+Licensed to the Apache Software Foundation (ASF) under one
+or more contributor license agreements.  See the NOTICE file
+distributed with this work for additional information
+regarding copyright ownership.  The ASF licenses this file
+to you under the Apache License, Version 2.0 (the
+"License"); you may not use this file except in compliance
+with the License.  You may obtain a copy of the License at
+
+  http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing,
+software distributed under the License is distributed on an
+"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+KIND, either express or implied.  See the License for the
+specific language governing permissions and limitations
+under the License.
+
 
 ## Project lead