Replace a remaining instance of AGPL with Apache + Commons Clause

contrib/stopwords/scraper.go

@@ -27,20 +27,10 @@ func main() {
 	w := bufio.NewWriter(f)
 	w.WriteString(heredoc.Doc(`
 		/*
-		 * Copyright (C) 2017 Dgraph Labs, Inc. and Contributors
+		 * Copyright 2017-2018 Dgraph Labs, Inc.
 		 *
-		 * This program is free software: you can redistribute it and/or modify
-		 * it under the terms of the GNU Affero General Public License as published by
-		 * the Free Software Foundation, either version 3 of the License, or
-		 * (at your option) any later version.
-		 *
-		 * This program is distributed in the hope that it will be useful,
-		 * but WITHOUT ANY WARRANTY; without even the implied warranty of
-		 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-		 * GNU Affero General Public License for more details.
-		 *
-		 * You should have received a copy of the GNU Affero General Public License
-		 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+		 * This file is available under the Apache License, Version 2.0,
+		 * with the Commons Clause restriction.
 		 */
 
 		package tok