add apache2 license for project (same as Mirador)

LICENSE

+Copyright 2018 The Board of Trustees of the Leland Stanford Junior University
+
+Licensed 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.

package.json

@@ -11,7 +11,7 @@
     "build": "node_modules/.bin/webpack"
   },
   "author": "Drew Winget <scipioaffricanus@gmail.com> (https://aeschylus.net/)",
-  "license": "MIT",
+  "license": "Apache-2.0",
   "repository": "https://github.com/ProjectMirador/research-and-demos/tree/master/minimal_redux_poc",
   "dependencies": {
     "node-fetch": "2.1.1",