Ensure that README gets devs into the right place.

Author: kellegous

Makefile

@@ -28,6 +28,9 @@ ui/bindata.go: .build/bin/go-bindata node_modules $(wildcard ui/assets/**/*)
 	npx webpack $(WEBPACK_ARGS)
 	$< -o $@ -pkg ui -prefix .build/ui -nomemcopy .build/ui/...
 
+dev: ALL
+	npm install
+
 test:
 	go test github.com/etsy/hound/...
 

README.md

@@ -128,6 +128,14 @@ make ui
 
 To make development easier, there is a flag that will read the files from the file system (allowing the much-loved edit/refresh cycle).
 
+First you should ensure you have all the dependencies installed that you need by running:
+
+```
+make dev
+```
+
+Then run the hound server with the --dev option:
+
 ```
 bin/houndd --dev
 ```