docs(README): Update link

Author: tony

README.md

@@ -154,6 +154,8 @@ All repositories in your ~/code directory:
 $ vcspull sync "$HOME/code/*"
 ```
 
+[libvcs]: https://github.com/vcs-python/libvcs
+
 <img src="https://raw.githubusercontent.com/vcs-python/vcspull/master/docs/_static/vcspull-demo.gif" class="align-center" style="width:45.0%" alt="image" />
 
 # Donations
@@ -179,6 +181,4 @@ See donation options at <https://git-pull.com/support.html>.
 - Open Hub: <https://www.openhub.net/p/vcspull>
 - License: [MIT](https://opensource.org/licenses/MIT).
 
-[libvcs]: https://github.com/vcs-python/libvcs
-
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