fix(deno): support Deno 1.4.0 strict type checks

[asos-craigmorten]

Fixes #19

Please note that this removes backcompat with TypeScript versions prior to 3.8 (REF: https://www.typescriptlang.org/docs/handbook/release-notes/typescript-3-8.html), please flag if that is an issue!

[nebrelbug]

@asos-craigmorten thanks for the PR! It looks perfect -- I'll merge it now.

I'm hopeful it won't cause breaking changes for any users, because Eta uses export * as ns Syntax already.... I guess I'll know if people start submitting issues 🤣 🤞

Thanks again!

Note: just published to https://deno.land/x/eta@v1.7.0. I can create a PR to update the version in Opine if you'd like

[nebrelbug]

By the way, do you mind if I add you to the README as a contributor?

[asos-craigmorten]

@nebrelbug awesome!

Feel free to add me if you like 😄 Keep up the great work!

Dw about Opine, have a PR already open tracking the required dependency updates 🙃

[nebrelbug]

@all-contributors please add @asos-craigmorten for code

[nebrelbug]

Hmm... I'll try again. @all-contributors please add @asos-craigmorten for code

[nebrelbug]

Okay, just fixed a bot config issue 😃. @all-contributors please add @asos-craigmorten for code

[allcontributors]

@nebrelbug

I've put up a pull request to add @asos-craigmorten! 🎉

[nebrelbug]

@asos-craigmorten finally added you, after messing with the GitHub bot a little 🤣

Thanks again for the PR! I'm excited to see what people build with Opine and Eta. I just added a feature which drastically improves Eta's speed w/ Opine, and should make Eta by far the fastest Deno template engine ⚡ 😁