change licence

DESCRIPTION

@@ -4,10 +4,18 @@ Description: Framework for building evolutionary algorithms for both single- and
 Version: 2.1.0
 Encoding: UTF-8
 Date: 2017-07-09
-Authors@R: c(person("Jakob", "Bossek", email = "[email protected]", role =
-    c("aut", "cre")))
+Authors@R: c(
+    person("Jakob", "Bossek", email = "[email protected]", role = c("aut", "cre", "cph")),
+    person("Michael H.", "Buselli", role = c("ctb", "cph")),
+    person("Wessel", "Dankers", role = c("ctb", "cph")),
+    person("Carlos M.", "Fonseca", role = c("ctb", "cph")),
+    person("Manuel", "Lopez-Ibanez", role = c("ctb", "cph")),
+    person("Luis", "Paquete", role = c("ctb", "cph")),
+    person("Joshua", "Knowles", role = c("ctb", "cph")),
+    person("Eckart", "Zitzler", role = c("ctb", "cph")),
+    person("Olaf", "Mersmann", role = "ctb"))
 Maintainer: Jakob Bossek <[email protected]>
-License: BSD_2_clause + file LICENSE
+License: GPL-3
 URL: https://github.com/jakobbossek/ecr2
 BugReports: https://github.com/jakobbossek/ecr2/issues
 Depends: