function capitalize(string) {
  return upperFirst(toString(string).toLowerCase());
}
Converts the first character of `string` to upper case and the remaining
to lower case.

@static
@memberOf _
@since 3.0.0
@category String
@param {string} [string=''] The string to capitalize.
@returns {string} Returns the capitalized string.
@example

_.capitalize('FRED');
// => 'Fred'