Add OPTIONS verb to node12 template

Changelog for 1.9.1:

• PR #222 Add options verb to node12 template by @jebos
• PR #198 update README with current versions by @lostapathy
• PR #219 Remove Java8 and arm-based templates by @alexellis

Commits
3b4f9eb Add options verb to node12 template, so a function implementation in handler.js can implement custom response behavior by @jebos
b4d496b Update watchdog version by @alexellis
1885887 Remove armhf templates from README by @alexellis
1f1c08d update README with current versions by @lostapathy
bf0e324 Remove Java8 and arm-based templates by @alexellis

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