fix: fix range parsing when upper limit = 0 (#687)

Author: sheerlox

tests/crontime.test.js

@@ -70,7 +70,7 @@ describe('crontime', () => {
 		}).not.toThrow();
 	});
 
-	it('should accept all valid ranges (0-59 0-59 1-23 1-31 0-12 0-6)', () => {
+	it('should accept all valid ranges (0-59 0-59 0-23 1-31 1-12 0-7)', () => {
 		expect(() => {
 			new cron.CronTime('0-59 0-59 1-23 1-31 0-11 0-6');
 		}).not.toThrow();