Add test for copyright with year range #2140

This issued existed on 3.0.2 and was fixed with commit:
7ca5115

Reported-by: @FlorianSW
Signed-off-by: Philippe Ombredanne <pombredanne@nexb.com>

tests/cluecode/data/copyrights/florian_notice.txt

@@ -0,0 +1,11 @@
+Spring Framework 5.2.6.RELEASE
+Copyright (c) 2002-2020 Pivotal, Inc.
+
+This product is licensed to you under the Apache License, Version 2.0
+(the "License"). You may not use this product except in compliance with
+the License.
+
+This product may include a number of subcomponents with separate
+copyright notices and license terms. Your use of the source code for
+these subcomponents is subject to the terms and conditions of the
+subcomponent's license, as noted in the license.txt file.

tests/cluecode/data/copyrights/florian_notice.txt.yml

@@ -0,0 +1,11 @@
+what:
+  - copyrights
+  - holders
+  - holders_summary
+copyrights:
+  - Copyright (c) 2002-2020 Pivotal, Inc.
+holders:
+  - Pivotal, Inc.
+holders_summary:
+  - value: Pivotal, Inc.
+    count: 1