Update README.md

Author: nicolaskruchten

README.md

@@ -105,7 +105,8 @@ pip install jupyterlab==1.2 "ipywidgets==7.5"
 or conda.
 
 ```
-conda install jupyterlab=1.2 "ipywidgets=7.5"
+conda install -c conda-forge jupyterlab=1.2
+conda install "ipywidgets=7.5"
 ```
 
 Then run the following commands to install the required JupyterLab extensions (note that this will require [`node`](https://nodejs.org/) to be installed):