Merge pull request #16 from benmathews/patch-1

fix instructions - docker build doesn't use -e

README.md

@@ -27,7 +27,8 @@ cd helm-app-operator-kit
 
 ```sh
 $ git checkout git@github.com:operator-framework/helm-app-operator-kit.git && cd helm-app-operator-kit
-$ docker build -t quay.io/<namespace>/<chart>-operator -e HELM_CHART=/path/to/helm/chart -e API_VERSION=<group/version> -e KIND=<Kind> .
+$ cd helm-app-operator && dep ensure && cd ..
+$ docker build -t quay.io/<namespace>/<chart>-operator --build-arg HELM_CHART=/path/to/helm/chart --build-arg API_VERSION=<group/version> --build-arg KIND=<Kind> .
 $ docker push quay.io/<namespace>/<chart>-operator
 ```