[NANOG-announce] additional hotel information for NANOG 52

Late breaking news:

The Warwick Denver Hotel has set aside some rooms for at a special
rate of $159/night.

To make reservations using this rate, call the hotel directly at
303-861-2000 and ask for Customer Reservations.

At last check, there were 19 rooms left for the Tuesday night, and
plenty of availability for the other nights.