Remove the constant module.

constant.js

@@ -1,22 +0,0 @@
-/**
- * Creates a function that returns `value`.
- *
- * @since 2.4.0
- * @category Util
- * @param {*} value The value to return from the new function.
- * @returns {Function} Returns the new constant function.
- * @example
- *
- * const objects = times(2, constant({ 'a': 1 }));
- *
- * console.log(objects);
- * // => [{ 'a': 1 }, { 'a': 1 }]
- *
- * console.log(objects[0] === objects[1]);
- * // => true
- */
-function constant(value) {
-  return () => value;
-}
-
-export default constant;