Jobs dependency - How to create schedule with jobs dependency?

How to create schedule with jobs dependency?
Example:
job2 execute only if job1 executed with success.

I try do this, but not working:

```
import schedule
import time

def now():
return time.strftime("%H:%M:%S")

def job1():
print("Working 10..." + now())
time.sleep(10)
print("Working 11..." + now())

def job2():
print("Working 20..." + now())
time.sleep(10)
print("Working 21..." + now())

schedule.every(30).seconds.do(job1).do(job2)

```

The program execute only last "do".
Result of execution:
I'm working 20...17:39:34
I'm working 21...17:39:44
I'm working 20...17:39:44
I'm working 21...17:39:54
I'm working 20...17:39:54
I'm working 21...17:40:04

Start with the chained schedule.every(30).seconds.do(job1).do(job2) example and inspect how the chained calls are registered and executed. Compare the observed output with the requested success-dependent ordering; done should be an agreed behavior for running job2 only after job1 succeeds.

Written by the indexing model from the issue text.