function uncapitalize( str ) {
	if ( !isString( str ) ) {
		throw new TypeError( format( 'invalid argument. First argument must be a string. Value: `%s`.', str ) );
	}
	return base( str );
}
Uncapitalizes the first character of a string.

@param {string} str - input string
@throws {TypeError} must provide a string
@returns {string} input string with first character converted to lowercase

@example
var out = uncapitalize( 'Last man standing' );
// returns 'last man standing'

@example
var out = uncapitalize( 'Presidential election' );
// returns 'presidential election'

@example
var out = uncapitalize( 'JavaScript' );
// returns 'javaScript'

@example
var out = uncapitalize( 'Hidden Treasures' );
// returns 'hidden Treasures'