package/libbson: add an upstream URL to Config.in

Add an upstream URL to the help text in Config.in. This
addresses the 'Missing' URL status in the package stats
web page output.

Signed-off-by: Mark Corbin <mark@dibsco.co.uk>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
diff --git a/package/libbson/Config.in b/package/libbson/Config.in
index 4305ca9..95f224e 100644
--- a/package/libbson/Config.in
+++ b/package/libbson/Config.in
@@ -5,5 +5,7 @@
 	  libbson is a library providing useful routines related to
 	  building, parsing, and iterating BSON documents.
 
+	  http://mongoc.org/libbson/
+
 comment "libbson needs a toolchain w/ threads"
 	depends on !BR2_TOOLCHAIN_HAS_THREADS