disable grading flag was wrong

Author: alesanchezr

.gitpod.yml

@@ -6,8 +6,7 @@ ports:
  - port: 3000
  onOpen: open-preview
 tasks:
- - command: >
- learnpack start --disable_grading;
+ - command: learnpack start --disableGrading;
 github:
  prebuilds:
  # enable for the master/default branch (defaults to true)