docs(readme): add Greenkeeper badge

1 files changed, 2 insertions, 0 deletions

diff --git a/README.md b/README.md
index f31f1e2..e2ee9cf 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,7 @@
 # Vim Vixen
 
+[![Greenkeeper badge](https://badges.greenkeeper.io/ueokande/vim-vixen.svg)](https://greenkeeper.io/)
+
 [![Join the chat room on Gitter for vim-vixen/vim-vixen](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/vim-vixen/vim-vixen)
 [![CircleCI](https://circleci.com/gh/ueokande/vim-vixen.svg?style=svg)](https://circleci.com/gh/ueokande/vim-vixen)
 [![devDependencies Status](https://david-dm.org/ueokande/vim-vixen/dev-status.svg)](https://david-dm.org/ueokande/vim-vixen?type=dev)