Set 1.4.2 release date

Author: danielnelson

CHANGELOG.md

@@ -49,7 +49,7 @@
 - [#3136](https://github.com/influxdata/telegraf/issues/3136): Fix webhooks input address in use during reload.
 - [#3258](https://github.com/influxdata/telegraf/issues/3258): Unlock Statsd when stopping to prevent deadlock.
 
-## v1.4.2 [unreleased]
+## v1.4.2 [2017-10-10]
 
 ### Bugfixes