reassign copyright to Lightbend

as per Rex's go-ahead at
#24 (comment)

Author: SethTisue

NOTICE

@@ -1,7 +1,11 @@
-scala-collection-laws
-Copyright (c) 2014-2019, Ichoran
+Copyright 2014-2019 Lightbend, Inc.
+
+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
 
-Licensed under the Apache License, Version 2.0 (the "License").
 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.