docs(readme): add Greenkeeper badge

greenkeeper[bot] · greenkeeper[bot] · commit 9c5803601043 · 2018-09-20T14:23:39.000Z
diff --git a/README.md b/README.md
@@ -1,4 +1,4 @@
-# webpack-dev-server-plugin [![npm version](https://badge.fury.io/js/%40glints%2Fhapi-webpack-dev-server-plugin.svg)](https://badge.fury.io/js/%40glints%2Fhapi-webpack-dev-server-plugin)
+# webpack-dev-server-plugin [![npm version](https://badge.fury.io/js/%40glints%2Fhapi-webpack-dev-server-plugin.svg)](https://badge.fury.io/js/%40glints%2Fhapi-webpack-dev-server-plugin) [![Greenkeeper badge](https://badges.greenkeeper.io/glints-dev/hapi-webpack-dev-server-plugin.svg)](https://greenkeeper.io/)
 
 This allows `webpack-dev-middleware` to be used with hapi.
 

Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,4 @@`
`1`		`-# webpack-dev-server-plugin [![npm version](https://badge.fury.io/js/%40glints%2Fhapi-webpack-dev-server-plugin.svg)](https://badge.fury.io/js/%40glints%2Fhapi-webpack-dev-server-plugin)`
	`1`	`+# webpack-dev-server-plugin [![npm version](https://badge.fury.io/js/%40glints%2Fhapi-webpack-dev-server-plugin.svg)](https://badge.fury.io/js/%40glints%2Fhapi-webpack-dev-server-plugin) [![Greenkeeper badge](https://badges.greenkeeper.io/glints-dev/hapi-webpack-dev-server-plugin.svg)](https://greenkeeper.io/)`
`2`	`2`
`3`	`3`	This allows `webpack-dev-middleware` to be used with hapi.
`4`	`4`