Update README.md

README.md

@@ -14,7 +14,7 @@ You can do this by installing [Miniconda](https://conda.io/miniconda.html)
 We will create a new `conda` environment with the dependencies.
 From inside the checked out PyClone-VI repository folder run the following.
 ```
-conda create -n pyclone-vi --file requirements.txt --yes
+conda create -c conda-forge -n pyclone-vi --file requirements.txt --yes
 ```
 
 3. Activate the `conda` environment.