message: Update readme on how to run the db migration command within waypoint
diff: @@ -70,13 +70,13 @@ Usage:
  ## Step 4: Run migrations (if any)
  Connect to the instance where the app is deployed:
  +
  ```sh
  waypoint exec -app=hub sh
  ```
  -Then, add node to the PATH and run the migrations:
  +Then, execute the db migrate command:
  +
  ```sh
  -heroku@ip-10-91-1-8:/ cd /workspace
  -heroku@ip-10-91-1-8:/workspace$ PATH=$PATH:/layers/heroku_nodejs-engine/nodejs/bin/;
  -heroku@ip-10-91-1-8:/workspace$ node dist/hub.js db migrate up
  +/workspace/packages/hub # node dist/hub.js db migrate up
  ```
  