Update cities to include the link for Vancouver (#14)

Added Vancouver to the cities list

Author: saubyk

cities.md

@@ -25,3 +25,4 @@ As a disclaimer, BitDevs NYC has no official associations with or oversight of t
 - [San Francisco](https://www.sfbitcoindevs.org/)
 - [Taipei](https://bitdevs.tw/)
 - [Tampa](https://tampabitdevs.io/)
+- [Vancouver](https://bitdevs.ca/)