Bump to v3.0.0.

function/once.js

@@ -0,0 +1,25 @@
+import before from './before';
+
+/**
+ * Creates a function that is restricted to invoking `func` once. Repeat calls
+ * to the function return the value of the first call. The `func` is invoked
+ * with the `this` binding of the created function.
+ *
+ * @static
+ * @memberOf _
+ * @type Function
+ * @category Function
+ * @param {Function} func The function to restrict.
+ * @returns {Function} Returns the new restricted function.
+ * @example
+ *
+ * var initialize = _.once(createApplication);
+ * initialize();
+ * initialize();
+ * // `initialize` invokes `createApplication` once
+ */
+function once(func) {
+  return before(func, 2);
+}
+
+export default once;