Bump to v3.0.0.

internal/mapSet.js

@@ -0,0 +1,18 @@
+/**
+ * Adds `value` to `key` of the cache.
+ *
+ * @private
+ * @name set
+ * @memberOf _.memoize.Cache
+ * @param {string} key The key of the value to cache.
+ * @param {*} value The value to cache.
+ * @returns {Object} Returns the cache object.
+ */
+function mapSet(key, value) {
+  if (key != '__proto__') {
+    this.__data__[key] = value;
+  }
+  return this;
+}
+
+export default mapSet;