Require Node.js 8, add support for nano and Emacs, add TypeScript definition

[BendingBender]

Build broken due to import-js/eslint-plugin-import#1322.

[sindresorhus]

I know you don't review the API thoroughly, but like I said before, if you see anything that could be improved in the API or otherwise, I'm all ears. Many of these modules I made years ago, and are not up to my current standards, documentation and API-wise.

[sindresorhus]

Thanks for adding additional editors ❤️

[BendingBender]

I generally would avoid using default as a function name, it has this ambiguity with ES exports. What about renaming it to defaultEditor? Should we then rename the other two to getEditor and allEditors? What about named exports after renaming?

[sindresorhus]

What about renaming it to defaultEditor? Should we then rename the other two to getEditor and allEditors? What about named exports after renaming?

Yeah, we can rename all the methods and make them named exports.