[WIP] Use XO instead of Standard (#723)

* Bump `eslint-plugin-react`

* Add `eslint-config-xo-react`

* Add XO

* Remove eslint-related dependencies, add XO config and use XO as the linter

* Code style: Standard => XO ✨

* Use xo property to ignore files

* Fix remaining errors

lib/utils/array.js

@@ -1,3 +1,3 @@
-export function last (arr) {
+export function last(arr) {
   return arr[arr.length - 1];
 }