Point to libmaple contributing doc more prominently.

It's wasting the users' and my time to have to point to this document
on every single pull request.

Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/HACKING b/HACKING
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+Read this before submitting patches:
+
+    http://leaflabs.com/docs/libmaple/contributing.html
+
+In particular, patches without sign-off lines will not be accepted.
+
+LeafLabs is a small shop.  Please help us merge your patches
+efficiently by getting formatting nits etc. out of the way before
+submitting.