This NPM module and GitHub repo contains the default token list used in the Uniswap interface.
To request that we add a token to the list, file an issue.
Don't forget to run yarn build and add the build folder to your commit before you push your changes.
Note filing an issue does not guarantee addition to this default token list. We do not review token addition requests in any particular order, and we do not guarantee that we will review your request to add the token to the default list.