Francesc Campoy ba966f5d89 doc: mention security from contribution guidelines
Fixes #15413

Change-Id: I837a391276eed565cf66d3715ec68b7b959ce143
Reviewed-on: https://go-review.googlesource.com/22390
Reviewed-by: Andrew Gerrand <adg@golang.org>
2016-04-23 00:01:22 +00:00
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2016-04-19 23:20:57 +00:00
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