argh, another copy-paste issue

maint/ssg.pc.in

@@ -6,7 +6,7 @@ includedir=@includedir@
 Name: ssg
 Description: Simple Stupid Group (SSG) interface for Mercury
 Version: 0.1
-URL: https://xgitlab.cels.anl.gov/sds/margo
+URL: https://xgitlab.cels.anl.gov/sds/ssg
 Requires: mercury
 Libs: -L${libdir} -lssg
 Cflags: -I${includedir}