2.0.0 (2021-09-03)

• perf()!: remove resize observer polyfill (e546baa), closes #442
• fix()!: maintain consistent item key when prepending items (1fee044), closes #380

BREAKING CHANGES

• If you have to support older browsers, add the resize
  observer polyfill to your project.
• this will change the item keys received if you use
  firstItemIndex.