Update README lab install instructions

Update README to include --overwrite for lab install instructions. Without this flag the command does not work
jupyter-widgets · Feb 3, 2021 · 2aa322d · 2aa322d
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diff --git a/README.md b/README.md
@@ -181,7 +181,7 @@ Now make some changes to your source code. Then:
 To develop this package against JupyterLab, run:
 
 - `pip install -e .` (installs python package for development, runs `yarn install` and `yarn run build` and installs the labextension)
-- `jupyter labextension develop <python_package_name>`.
+- `jupyter labextension develop <python_package_name> --overwrite`
 
 Now make some changes to your source code. Then: