Bump buildifier to 0.20.0

Change-Id: I563204d09d91646c7105738e797d21b5f1c0ca57
1 file changed
tree: 4ab68522110b7f2d27b10e0e99533f5b353d7d91
  1. jenkins/
  2. jenkins-docker/
  3. worker/
  4. .gitignore