Adding protoc dep to voltha build req (at least for mac)

Change-Id: I134f98de9bc7487882c53b13fa5e2f380e9d3f7e
diff --git a/BUILD.md b/BUILD.md
index b6c9c60..54453dc 100644
--- a/BUILD.md
+++ b/BUILD.md
@@ -299,6 +299,7 @@
 exit # from vagrant box back to your native environmnet
 vagrant destroy -f
 ```
+
 ### Single-node Kubernetes
 
 To run voltha in a Kubernetes environment, the "voltha" development machine can be configured as a Kubernetes master running in a single-node cluster.
@@ -344,6 +345,7 @@
 kubectl apply -f k8s/grafana.yml
 kubectl apply -f k8s/stats.yml
 ```
+
 #### Single-node Kubernetes with Etcd KV store
 
 Deploy the base components:
@@ -392,6 +394,7 @@
 * Python 2.7
 * virtualenv
 * brew (or macports if you prefer)
+* protoc
 
 ### Installing Voltha dependencies