title: Send patches against first email through git send-email
body: <p>I am currently working on a small assignment from an extra course in college. The task is to write a small program that does some work x, and a Makefile for it. We are to send the two files as a plain text email to our lecturer. We are then required to make a few changes to the program and send the changes as a patch to the first email. We are required to do this again.</p>
  
  <p>Something like this:</p>
  
  <p>program1
  |--> patch for change2
       |--> patch for change3</p>
  
  <p>While i have no issues with the programming part, i'm having difficulty understanding how i could achieve this through git send-email. A detailed elucidation of the process for a beginner would be very much appreciated.</p>