Allow lowcase ttl @tables property type

[ryanblock]

Thank you for helping out! ✨

We really appreciate your commitment to improving Architect

To maintain a high standard of quality in our releases, before merging every pull request we ask that you've completed the following:

• Forked the repo and created your branch from master
• Made sure tests pass (run npm it from the repo root)
• Expanded test coverage related to your changes:
  • Added and/or updated unit tests (if appropriate)
  • Added and/or updated integration tests (if appropriate)
• Updated relevant documentation:
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  • Architect docs (arc.codes)
• Summarized your changes in changelog.md
• Linked to any related issues, PRs, etc. below that may relate to, consume, or necessitate these changes

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Thanks again!

[tbeseda]

Right on tyvm