chore!: Clarify license for generated plurals package (#19)

BREAKING CHANGE: The canonical 'make-plural' package is now licensed
with the OSI-apporved Unicode Data Files and Software License, as it is
based on the data provided in the 'cldr-core' package, which is thus
licensed.

Author: eemeli

LICENSE

@@ -1,4 +1,4 @@
-Copyright (c) 2014-2019 by Eemeli Aro <[email protected]>
+Copyright © Eemeli Aro <[email protected]>
 
 Permission to use, copy, modify, and/or distribute this software for any
 purpose with or without fee is hereby granted, provided that the above

packages/plurals/LICENSE

@@ -0,0 +1,32 @@
+Copyright © Eemeli Aro <[email protected]>
+Copyright © 1991-2020 Unicode, Inc. All rights reserved.
+Distributed under the Terms of Use in https://www.unicode.org/copyright.html.
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of the Unicode data files and any associated documentation
+(the "Data Files") or Unicode software and any associated documentation
+(the "Software") to deal in the Data Files or Software
+without restriction, including without limitation the rights to use,
+copy, modify, merge, publish, distribute, and/or sell copies of
+the Data Files or Software, and to permit persons to whom the Data Files
+or Software are furnished to do so, provided that either
+(a) this copyright and permission notice appear with all copies
+of the Data Files or Software, or
+(b) this copyright and permission notice appear in associated
+Documentation.
+
+THE DATA FILES AND SOFTWARE ARE PROVIDED "AS IS", WITHOUT WARRANTY OF
+ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
+WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT OF THIRD PARTY RIGHTS.
+IN NO EVENT SHALL THE COPYRIGHT HOLDER OR HOLDERS INCLUDED IN THIS
+NOTICE BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL
+DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
+DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+PERFORMANCE OF THE DATA FILES OR SOFTWARE.
+
+Except as contained in this notice, the name of a copyright holder
+shall not be used in advertising or otherwise to promote the sale,
+use or other dealings in these Data Files or Software without prior
+written authorization of the copyright holder.

packages/plurals/package.json

@@ -10,7 +10,7 @@
     "pluralization"
   ],
   "author": "Eemeli Aro <[email protected]>",
-  "license": "ISC",
+  "license": "Unicode-DFS-2016",
   "homepage": "https://github.com/eemeli/make-plural#readme",
   "repository": {
     "type": "git",