Add ember-lts-3.16 and ember-lts-3.20 to CI.#135

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rwjblue wants to merge 1 commit intohtml-next:masterfrom rwjblue:additional-lts-for-testing

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Commits on Oct 13, 2020

Add ember-lts-3.16 and ember-lts-3.20 to CI.
rwjblue
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