perl-gdgraph: add hash file

Signed-off-by: Francois Perrad <francois.perrad@gadz.org>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/perl-gdgraph/perl-gdgraph.hash

@@ -0,0 +1,3 @@
+# retrieved by scancpan from http://cpan.metacpan.org/
+md5    2c9e4feb4246200d96b9faa8024b0bf0 GDGraph-1.48.tar.gz
+sha256 4324a104557edaf8925a20f24326af89c08e419989fbaa7380f0c9731bc2ac6c GDGraph-1.48.tar.gz