replace license with spdx.org variant

OBS-URL: https://build.opensuse.org/package/show/openSUSE:Factory/wireshark?expand=0&rev=47

wireshark.spec

@@ -22,7 +22,7 @@
 Name:           wireshark
 Version:        1.6.3
 Release:        1
-License:        GPLv2+
+License:        GPL-2.0+
 Summary:        A Network Traffic Analyser
 Url:            http://www.wireshark.org/
 Group:          Productivity/Networking/Diagnostic
@@ -75,7 +75,7 @@ features, including a rich display filter language and the ability to
 view the reconstructed stream of a TCP session.
 
 %package devel
-License:        GPLv2+
+License:        GPL-2.0+
 Summary:        A Network Traffic Analyser
 Group:          Development/Libraries/C and C++
 Requires:       %{name} = %{version}