v5.0.0

• Migrated from default to named export (see why here lukeed/klona#17):

ESM/TypeScript

- import isPlainObject from 'is-plain-object';
+ import { isPlainObject } from 'is-plain-object';

CommonJS

- const isPlainObject = require('is-plain-object');
+ const { isPlainObject } = require('is-plain-object');

• Added native ESM support via exports mapping