Bump to v4.0.0.

collection.default.js

@@ -0,0 +1,35 @@
+import at from './at';
+import countBy from './countBy';
+import each from './each';
+import eachRight from './eachRight';
+import every from './every';
+import filter from './filter';
+import find from './find';
+import findLast from './findLast';
+import forEach from './forEach';
+import forEachRight from './forEachRight';
+import groupBy from './groupBy';
+import includes from './includes';
+import invokeMap from './invokeMap';
+import keyBy from './keyBy';
+import map from './map';
+import orderBy from './orderBy';
+import partition from './partition';
+import reduce from './reduce';
+import reduceRight from './reduceRight';
+import reject from './reject';
+import sample from './sample';
+import sampleSize from './sampleSize';
+import shuffle from './shuffle';
+import size from './size';
+import some from './some';
+import sortBy from './sortBy';
+
+export default {
+  at, countBy, each, eachRight, every,
+  filter, find, findLast, forEach, forEachRight,
+  groupBy, includes, invokeMap, keyBy, map,
+  orderBy, partition, reduce, reduceRight, reject,
+  sample, sampleSize, shuffle, size, some,
+  sortBy
+};