dev-R/*: improve metadata

Signed-off-by: Alessandro Barbieri <lssndrbarbieri@gmail.com>

dev-R/diffobj/metadata.xml

@@ -6,8 +6,10 @@
 		<email>lssndrbarbieri@gmail.com</email>
 		<name>Alessandro Barbieri</name>
 	</maintainer>
-	<longdescription lang="en">
-		Diffs for R Objects // Generate a colorized diff of two R objects
-		for an intuitive visualization of their differences.
-	</longdescription>
+	<upstream>
+		<maintainer>
+			<name>Brodie Gaslam</name>
+			<email>brodie.gaslam@yahoo.com</email>
+		</maintainer>
+	</upstream>
 </pkgmetadata>