Update Quandl.cs
Update Quandl.cs

Cleaned up URL

JKarathiya/Lean,AlexCatarino/Lean,jameschch/Lean,StefanoRaggi/Lean,StefanoRaggi/Lean,JKarathiya/Lean,AlexCatarino/Lean,JKarathiya/Lean,jameschch/Lean,jameschch/Lean,StefanoRaggi/Lean,StefanoRaggi/Lean,jameschch/Lean,StefanoRaggi/Lean,JKarathiya/Lean,QuantConnect/Lean,jameschch/Lean,QuantConnect/Lean,AlexCatarino/Lean,QuantConnect/Lean,AlexCatarino/Lean,QuantConnect/Lean