update copyright for post 2013 contributions

wholmgren · wholmgren · commit d1d9519d8cbf · 2016-05-24T11:27:52.000-07:00
diff --git a/LICENSE b/LICENSE
@@ -1,6 +1,9 @@
 Copyright (c) 2013, Sandia National Labs
 All rights reserved.
 
+Copyright (c) 2014-2016, PVLIB Python Developers
+All rights reserved.
+
 Redistribution and use in source and binary forms, with or without modification,
 are permitted provided that the following conditions are met:
 
