title: Heroku Deployment Error: No matching distribution found for en-core-web-sm
body: <p>I am trying to deploy my Django and spaCy project to Heroku. But I am getting an error: No matching distribution found for en-core-web-sm (It is an ML model downloadable via pip). How can I solve this problem? The model is installed locally in a virtual environment and working alright. I got the requirements file via pip freeze. I am using Python 3.6.4.</p>