Transform comma into period

josegonzalez · josegonzalez · commit be304ec688e0 · 2015-09-07T13:56:20.000-04:00
This was probably meant as a separate sentence but is now
"proper english."

Signed-off-by: Jose Diaz-Gonzalez &lt;jose@seatgeek.com&gt;
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
@@ -25,7 +25,7 @@ The Docker maintainers take security seriously. If you discover a security
 issue, please bring it to their attention right away!
 
 Please **DO NOT** file a public issue, instead send your report privately to
-[security@docker.com](mailto:security@docker.com), 
+[security@docker.com](mailto:security@docker.com).
 
 Security reports are greatly appreciated and we will publicly thank you for it.
 We also like to send gifts&mdash;if you're into Docker schwag, make sure to let
