Update CHANGELOG

Author: sandeepmistry

CHANGELOG

@@ -1,9 +1,10 @@
-NTPClient 3.0.0 - ????.??.??
+NTPClient 3.0.0 - 2016.04.19
 
 * Constructors now require UDP instance argument, to add support for non-ESP8266 boards
 * Added optional begin API to override default local port
 * Added end API to close UDP socket
 * Changed return type of update and forceUpdate APIs to bool, and return success or failure
+* Change return type of getDay, getHours, getMinutes, and getSeconds to int
 
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