change notice copyright date from 2019 to 2019-2020 (#2847)

* add source license full text into source license

* exclude ScriptRunner.java on rat check

* change notice copyright date from 2019 to 2019-2020

NOTICE

 Apache DolphinScheduler (incubating)
-Copyright 2019 The Apache Software Foundation
+Copyright 2019-2020 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).

dolphinscheduler-dist/release-docs/NOTICE

 Apache DolphinScheduler (incubating)
-Copyright 2019 The Apache Software Foundation
+Copyright 2019-2020 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).