Fix build

Author: sethvargo

.travis.yml

@@ -4,13 +4,14 @@ language: ruby
 cache: bundler
 
 env:
-  - VAULT_VERSION=0.6.4
+  - VAULT_VERSION=0.7.3
+  - VAULT_VERSION=0.6.5
   - VAULT_VERSION=0.5.3
 
 before_install:
   - curl -sLo vault.zip https://releases.hashicorp.com/vault/${VAULT_VERSION}/vault_${VAULT_VERSION}_linux_amd64.zip
   - unzip vault.zip
-  - mkdir ~/bin
+  - mkdir -p ~/bin
   - mv vault ~/bin
   - export PATH="~/bin:$PATH"