title: discord.py scheduler to stop
body: <p>I have this schedule tasks using apscheduler.schedulers.asyncio.AsyncIOScheduler when I say <code>-startc</code> the schedule starts. When I say <code>stopc</code> I want the schedule to stop.</p>
  <pre><code>@commands.command()
  @commands.has_permissions(administrator=True)
  async def startc(self, ctx):
  
      channel = ctx.channel.id
      self.client.scheduler.add_job(self.cardDrop, CronTrigger(second='0, 10, 20, 30, 40, 50'), args=[channel])
  
  @commands.command()
  @commands.has_permissions(administrator=True)
  async def stopc(self, ctx):
  </code></pre>