Update installation instructions to upgrade server extension

jaipreet-s · web-flow · commit 644ca9839ccd · 2019-06-11T14:16:49.000-07:00
diff --git a/README.md b/README.md
@@ -21,7 +21,7 @@ To install perform the following steps:
 
 ```bash
 jupyter labextension install @jupyterlab/git
-pip install jupyterlab-git
+pip install --upgrade jupyterlab-git
 jupyter serverextension enable --py jupyterlab_git
 ```
 
