Update Weeder configuration
Updatd from the old `.dhall` format to the new `.toml` format using a script provided by the author of Weeder: https://github.com/ocharles/weeder/issues/130
Updatd from the old `.dhall` format to the new `.toml` format using a script provided by the author of Weeder: https://github.com/ocharles/weeder/issues/130