Bump to v4.0.0.

internal/basePickBy.js

@@ -0,0 +1,21 @@
+import baseForIn from './baseForIn';
+
+/**
+ * The base implementation of  `_.pickBy` without support for iteratee shorthands.
+ *
+ * @private
+ * @param {Object} object The source object.
+ * @param {Function} predicate The function invoked per property.
+ * @returns {Object} Returns the new object.
+ */
+function basePickBy(object, predicate) {
+  var result = {};
+  baseForIn(object, function(value, key) {
+    if (predicate(value)) {
+      result[key] = value;
+    }
+  });
+  return result;
+}
+
+export default basePickBy;