Fixup formatting of circle config

Author: brynary

circle.yml

@@ -5,12 +5,11 @@ machine:
     CLOUDSDK_CORE_DISABLE_PROMPTS: 1
 
 dependencies:
-  pre:
+  override:
     - echo $gcloud_json_key_base64 | sed 's/ //g' | base64 -d > /tmp/gcloud_key.json
     - curl https://sdk.cloud.google.com | bash
     - gcloud auth activate-service-account --key-file /tmp/gcloud_key.json
     - gcloud docker -a
-  override:
 
 test:
   override: