Taimoor Ahmad

@Jab I'm not sure about the key handler (never used it for `sxiv`). Take a look at #363 , I made it so that `-o` prints in order of selection,...

Let me know if there are any bugs. If you can comment on the pull request I'd appreciate that too.

Still having this issue with Node.js 14 LTS. Decided to use [memjs](https://www.npmjs.com/package/memjs) instead, it also supports promises.