update contributing.md

CONTRIBUTING.md

@@ -42,18 +42,18 @@ Run `bash scripts/glide/status.sh` to get a list of vendored dependencies that m
 
 ## Vagrant
 
-If you are a [Vagrant](https://www.vagrantup.com/) user, all you have to do to get started hacking Tendermint is:
+If you are a [Vagrant](https://www.vagrantup.com/) user, you can get started hacking Tendermint with the commands below.
 
-In case you installed Vagrant in 2017, you might need to run
+NOTE: In case you installed Vagrant in 2017, you might need to run
 `vagrant box update` to upgrade to the latest `ubuntu/xenial64`.
 
 ```
 vagrant up
 vagrant ssh
-cd ~/go/src/github.com/tendermint/tendermint
 make test
 ```
 
+
 ## Testing
 
 All repos should be hooked up to circle.