Bump to v4.0.0.

number.js

@@ -1,7 +1,4 @@
-import inRange from './number/inRange';
-import random from './number/random';
-
-export default {
-  'inRange': inRange,
-  'random': random
-};
+export { default as clamp } from './clamp';
+export { default as inRange } from './inRange';
+export { default as random } from './random';
+export { default as default } from './number.default';