fix(README): fix typo

Author: carmstrong

README.md

@@ -204,7 +204,7 @@ pin it down.
 Common issues that users have run into when provisioning Deis are detailed below.
 
 #### When running a `make` action - 'Failed initializing SSH client: ssh: handshake failed: ssh: unable to authenticate'
-Did you remember to add your SSH key to the ssh-agent? `ssh-agent -L` should list the key you used to provision the servers. If it's not there, `ssh-add -K `/path/to/your/key`.
+Did you remember to add your SSH key to the ssh-agent? `ssh-agent -L` should list the key you used to provision the servers. If it's not there, `ssh-add -K /path/to/your/key`.
 
 #### Various NFS issues, specifically an 'access denied' error
 The easiest workaround for this is to use rsync instead of NFS. In the Vagrantfile, swap out the `config.vm.synced_folder` line for the commented version.