NTPClient 3.1.0 - 2016.05.31

* Added functions for changing the timeOffset and updateInterval later. Thanks @SirUli

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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* Changes not recorded
