docs(readme): add Greenkeeper badge

BerkeleyTrue · May 31, 2018 · c9aa6ec · c9aa6ec
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Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/README.md b/README.md
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 # Warning [![npm version](https://badge.fury.io/js/warning.svg)](https://badge.fury.io/js/warning)
+
+[![Greenkeeper badge](https://badges.greenkeeper.io/BerkeleyTrue/warning.svg)](https://greenkeeper.io/)
 A mirror of Facebook's [Warning](https://github.com/facebook/fbjs/blob/master/packages/fbjs/src/__forks__/warning.js)