note user_count is only from GeoIP2 Precision Insights

Author: 2shortplanks

geoip2/records.py

@@ -692,7 +692,8 @@ class Traits(Record):
 
       The estimated number of users sharing the IP/network during the past 24
       hours. For IPv4, the count is for the individual IP. For IPv6, the count
-      is for the /64 network.
+      is for the /64 network. This attribute is only available from GeoIP2
+      Precision Insights.
 
       :type: int