Revert "fix heroku again"

Signed-off-by: BoHong Li <raccoon@hackmd.io>

bin/heroku

@@ -4,16 +4,7 @@ set -e
 
 if [ ! -z "$DYNO" ]; then
   # setup config files
-  cat << EOF > .sequelizerc
-const path = require('path')
-const config = require('./lib/config')
-
-module.exports = {
-  'migrations-path': path.resolve('lib', 'migrations'),
-  'models-path': path.resolve('lib', 'models'),
-  url: process.env['CMD_DB_URL'] || config.dbURL
-}
-EOF
+  cp .sequelizerc.example .sequelizerc
 
     cat << EOF > config.json