This release fixes a bug that prevented connecting to IPv4-only MongoDB servers
by hostname.
https://jira.mongodb.org/browse/CDRIVER-1988
The driver has reverted to its 1.5.1 behavior: it connects to MongoDB over IPv6
if given an IPv6 connection string like "mongodb://[::1]", and requires an IPv4
connection when given a hostname like "mongodb://localhost".
Peace,
A. Jesse Jiryu Davis