Bump to v3.0.0.

internal/charAtCallback.js

@@ -0,0 +1,12 @@
+/**
+ * Used by `_.max` and `_.min` as the default callback for string values.
+ *
+ * @private
+ * @param {string} string The string to inspect.
+ * @returns {number} Returns the code unit of the first character of the string.
+ */
+function charAtCallback(string) {
+  return string.charCodeAt(0);
+}
+
+module.exports = charAtCallback;