feat: add playwright exmaple

[irrationnelle]

Playwright is recently considered interesting automate tool for browser like selenium, puppeteer.
But there is no example for Playwright yet, so I suggest this PR.
IMHO, this example is very simple and quintessential, but any feedback could improve also this PR.
Thank you!

[craigtaub]

Thanks, nice example 👍🏻

[craigtaub]

You can probably remove the values which are the default, i.e. everything except timeout.

[irrationnelle]

Thank you for feedback!

.mocharc.json is removed and timeout option is moved to package.json.

and to pass Travis CI, I modified below:

• add timeout option with 10000 value for selenium and vue-puppeteer

• add Promise to async operation of node-sqlite3, because sometimes test is failed against non-existent value. Check here. IMHO, this would be an asynchronous problem, for example 1) before insert value, request value from table 2) first create table and then drop table. I would like to ask @MoonSupport to confirm my idea 🙏.

[irrationnelle]

I missed something out.

chromedriver is updated with ^85.0.0 to pass Travis CI that installed chrome v85 as stable version for selenium example.