Fix broken gitref link in README.md

gitref.org points to services.github.com, and has been for some time[0]. [0] git/git-reference#112
rdacquisto · May 4, 2019 · be65fe5 · be65fe5
1 parent 0916075
commit be65fe5
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/README.md b/README.md
@@ -126,6 +126,6 @@ This project is licensed under the MIT License.
 [3]: http://git-scm.com
 [4]: https://github.com
 [5]: http://gitimmersion.com
-[6]: http://gitref.org
+[6]: https://git.github.io/git-reference/
 [7]: http://www.bash2zsh.com/zsh_refcard/refcard.pdf
 [8]: http://grml.org/zsh/zsh-lovers.html