fix(minify): upgrade terser to v5, etc.

[Francois-Esquire]

This PR upgrades terser to v5 and adds a test case to test for ES2020 syntax (specifically optional chaining). Relates to issue #17 and #19.

[brodybits]

adds a test case to test for ES2020 syntax

It would be awesome if you want to put this info into the commit message.

Unfortunately #18 (remove Node.js pre-14 support) seems to be a prerequisite for this. I may do this soon.

I may have a few more nits coming on this, and some more comments coming on original issue #17.

---

P.S. Adding a link to related issue: TrySound#61

[brodybits]

Looks good in general.

My one major criticism is the use of "next" as ES2020 would be 2-3 years old by now.

IMHO adding tests is not as important when updating dependencies. I think tests are way more important when making bug fixes or adding new features.

It looks to me like this proposal includes several related items, which is why I added ", etc." to the title of this PR:

• update Terser to v5
• add test of ES2020
• test with updated @rollup/plugin-terser
• update README.md with updated @rollup/plugin-terser

[brodybits]

@Francois-Esquire I have just released another patch and started version 0.14.0 with minimum Node.js version 14. I would like to get the terser v5 upgrade out pretty soon. If you can rebase this and address my comments soon then I can merge it in. Otherwise I may just do this upgrade without the test case.

I will start updating some other dependencies now.

[brodybits]

@Francois-Esquire never mind, I am taking the liberty to fix this up myself and will merge this as a squash commit. I would like to get this finished soon. Thanks and apologies.

[Francois-Esquire]

@brodybits Thanks so much for taking the lead on this, truly appreciate it! And thanks for staying committed to this package, has been a huge help for us 🙌

[brodybits]

These updates are now published in v0.14.1 (0.14.0 was published with missing contents).

FYI I am currently available for short-term and long-term opportunities in case anyone in your organization may be interested, private contact chris.brody@gmail.com.