Use license macro for COPYING

https://fedoraproject.org/wiki/Packaging:LicensingGuidelines#License_Text

simple-scan.spec

@@ -43,7 +43,8 @@ fi
 glib-compile-schemas %{_datadir}/glib-2.0/schemas &> /dev/null || :
 
 %files -f %{name}.lang
-%doc COPYING NEWS README.md
+%doc NEWS README.md
+%license COPYING
 %{_mandir}/man1/%{name}.1*
 %{_bindir}/%{name}
 %{_datadir}/appdata/%{name}.appdata.xml
@@ -54,6 +55,7 @@ glib-compile-schemas %{_datadir}/glib-2.0/schemas &> /dev/null || :
 %changelog
 * Mon Feb 16 2015 David King <amigadave@amigadave.com> - 3.15.90-1
 - Update to 3.15.90
+- Use license macro for COPYING
 
 * Mon Jan 19 2015 David King <amigadave@amigadave.com> - 3.15.4-1
 - Update to 3.15.4