Unexpected behavior for key named 'on'

[DennisDenuto]

What steps did you take: I was trying to create a template for a github action:

on:
  push:
    branches:
      - develop

What happened: ytt -f github-action.yml

results in:

true:
  push:
    branches:
    - develop

What did you expect: For the key 'on' to stay as 'on' and not change to 'true'

Environment:

• ytt version (use ytt --version): ytt version 0.36.0
• OS (e.g. from /etc/os-release): osx

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[pivotaljohn]

duplicate of #407.