Fixes message about having too may symbols
Fixes message about having too may symbols

Previous message was not user-friendly:
We currently only support 50 second at a time due to physical memory limitations
Changed for:
We currently only support 50 symbols subscribed with second resolution at a time due to physical memory limitations

kaffeebrauer/Lean,redmeros/Lean,Mendelone/forex_trading,andrewhart098/Lean,jameschch/Lean,jameschch/Lean,Jay-Jay-D/LeanSTP,AnshulYADAV007/Lean,kaffeebrauer/Lean,Jay-Jay-D/LeanSTP,QuantConnect/Lean,StefanoRaggi/Lean,AnshulYADAV007/Lean,jameschch/Lean,redmeros/Lean,redmeros/Lean,Jay-Jay-D/LeanSTP,QuantConnect/Lean,StefanoRaggi/Lean,kaffeebrauer/Lean,QuantConnect/Lean,Jay-Jay-D/LeanSTP,AlexCatarino/Lean,JKarathiya/Lean,Mendelone/forex_trading,andrewhart098/Lean,StefanoRaggi/Lean,AnshulYADAV007/Lean,kaffeebrauer/Lean,StefanoRaggi/Lean,QuantConnect/Lean,AlexCatarino/Lean,young-zhang/Lean,young-zhang/Lean,andrewhart098/Lean,Mendelone/forex_trading,AlexCatarino/Lean,jameschch/Lean,redmeros/Lean,JKarathiya/Lean,Jay-Jay-D/LeanSTP,young-zhang/Lean,AlexCatarino/Lean,jameschch/Lean,Mendelone/forex_trading,StefanoRaggi/Lean,andrewhart098/Lean,kaffeebrauer/Lean,JKarathiya/Lean,AnshulYADAV007/Lean,JKarathiya/Lean,young-zhang/Lean,AnshulYADAV007/Lean