updated docs to better describe testing procedure with new repo

AUTHORS

@@ -51,4 +51,5 @@ Contributors are:
 -Luke Twist <itsluketwist@gmail.com>
 -Joseph Hale <me _at_ jhale.dev>
 -Santos Gallegos <stsewd _at_ proton.me>
+-Wenhan Zhu <wzhu.cosmos _at_ gmail.com>
 Portions derived from other open source works and are clearly marked.

README.md

@@ -93,9 +93,9 @@ See [Issue #525](https://github.com/gitpython-developers/GitPython/issues/525).
 
 ### RUNNING TESTS
 
-_Important_: Right after cloning this repository, please be sure to have executed
-the `./init-tests-after-clone.sh` script in the repository root. Otherwise
-you will encounter test failures.
+_Important_: Right after cloning this repository, please be sure to have
+executed `git fetch --tags` followed by the `./init-tests-after-clone.sh`
+script in the repository root. Otherwise you will encounter test failures.
 
 On _Windows_, make sure you have `git-daemon` in your PATH. For MINGW-git, the `git-daemon.exe`
 exists in `Git\mingw64\libexec\git-core\`; CYGWIN has no daemon, but should get along fine