Migrate to tabs

[antonk52]

No runtime changes

Since lilconfig's one of the core feature is being small in size and it is no longer uses typescript to transpile. It means that we now fully control the javascript that we ship to npm. Migrating to tabs instead of spaces saves some space for the onyl runtime file shipped. Specifically it went from 15.2kB to 11.4kB ~ 25% smaller. Also updated package.json to use 2 spaces which is the npm default.

Before

▲ npm pack --dry-run
npm notice
npm notice 📦  [email protected]
npm notice === Tarball Contents ===
npm notice 1.1kB  LICENSE
npm notice 1.2kB  package.json
npm notice 2.6kB  readme.md
npm notice 1.7kB  src/index.d.ts
npm notice 15.2kB src/index.js

After

▲ npm pack --dry-run
npm notice
npm notice 📦  [email protected]
npm notice === Tarball Contents ===
npm notice 1.1kB  LICENSE
npm notice 1.1kB  package.json
npm notice 2.6kB  readme.md
npm notice 1.6kB  src/index.d.ts
npm notice 11.4kB src/index.js