Update RELEASE.md

RELEASE.md

@@ -1,15 +1,12 @@
-# Making a new release of jupyter-resource-usage
+# Making a new release of `jupyter-resource-usage`
 
 ## Getting a clean environment
 
 Creating a new environment can help avoid pushing local changes and any extra tag.
 
 ```bash
-conda create -n jupyter-resource-usage-release -c conda-forge twine keyring jupyter-packaging python
+mamba create -n jupyter-resource-usage-release -c conda-forge twine keyring jupyter-packaging=0.7 jupyterlab=3 python
 conda activate jupyter-resource-usage-release
-
-# install JupyterLab to build the extension
-python -m pip install --pre jupyterlab
 ```
 
 Alternatively, the local repository can be cleaned with:
@@ -23,13 +20,14 @@ git clean -fdx
 Make sure the `dist/` folder is empty.
 
 1. Update the version in `setup.py`
-2. `python setup.py sdist bdist_wheel`
-3. Double check the size of the bundles in the `dist/` folder
-4. Run the tests
+2. If the JupyterLab extension has changed, make sure to bump the version number in `packages/labextension/package.json`
+3. `python setup.py sdist bdist_wheel`
+4. Double check the size of the bundles in the `dist/` folder
+5. Run the tests
   - `pip install "dist/jupyter-resource-usage-X.Y.Z-py3-none-any.whl[dev]"`
   - `python -m pytest`
-5. `export TWINE_USERNAME=mypypi_username`
-6. `twine upload dist/*`
+6. `export TWINE_USERNAME=mypypi_username`
+7. `twine upload dist/*`
 
 ## Releasing on conda-forge