{
  list: {
    '0': {
      id: 0,
      dueDate: 'By May 28th I Will have: ',
      goals: [
        {
         0: {...}
         1: {...}
         3: {...}
        }
      ]
    }
   '1':{
      id: 0,
      dueDate: 'By June 31st I Will have: ',
      goals: [
        {
         2: {...}
         4: {...}
        }
}

return {
        ...state,
        [action.payload.keyName]: {
          ...state[action.payload.keyName],
          goals: [
            { ...state[action.payload.keyName].goals, ...action.payload.goal },
            ...state[action.payload.keyName].goals.slice(1, state[action.payload.keyName].goals.length)
          ]
        }
      };