title: Creating a patch file from a diff of 2 folders
body: <p>I made some changes to an open source project without taking time to create proper patch files.</p>
  <p>Now, the maintainer of the project released a new version, and among new and edited files, there are a bunch of renamed files.</p>
  <p>What is the best way to apply my changes to the new version ?<br />
  I'm completely new to diff/patch use, and If I can get it done with git, it would be better.</p>