Bump to v4.7.0.

collection.js

@@ -8,6 +8,8 @@ module.exports = {
   'find': require('./find'),
   'findLast': require('./findLast'),
   'flatMap': require('./flatMap'),
+  'flatMapDeep': require('./flatMapDeep'),
+  'flatMapDepth': require('./flatMapDepth'),
   'forEach': require('./forEach'),
   'forEachRight': require('./forEachRight'),
   'groupBy': require('./groupBy'),