Merge pull request opencontainers#28 from wking/linux-foundation-address

CONTRIBUTING: Update Linux Foundation address in the DCO

Author: caniszczyk

CONTRIBUTING.md

@@ -76,8 +76,9 @@ Developer Certificate of Origin
 Version 1.1
 
 Copyright (C) 2004, 2006 The Linux Foundation and its contributors.
-660 York Street, Suite 102,
-San Francisco, CA 94110 USA
+1 Letterman Drive
+Suite D4700
+San Francisco, CA, 94129
 
 Everyone is permitted to copy and distribute verbatim copies of this
 license document, but changing it is not allowed.