fix linter errors
fix linter errors

jasnow/classroom,jasnow/classroom,hackerkid/classroom,mkcode/classroom,hackerkid/classroom,mkcode/classroom,ConnorCartwright/classroom,jasnow/classroom,BelieveC/classroom,BelieveC/classroom,ConnorCartwright/classroom,BelieveC/classroom,hackerkid/classroom,BelieveC/classroom,mkcode/classroom,ConnorCartwright/classroom