Remove identity module.

identity.js

@@ -1,19 +0,0 @@
-/**
- * This method returns the first argument it receives.
- *
- * @since 0.1.0
- * @category Util
- * @param {*} value Any value.
- * @returns {*} Returns `value`.
- * @example
- *
- * const object = { 'a': 1 };
- *
- * console.log(identity(object) === object);
- * // => true
- */
-function identity(value) {
-  return value;
-}
-
-export default identity;