Add CHANGELOG.md

Author: clue

CHANGELOG.md

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+# CHANGELOG
+
+This file is a manually maintained list of changes for each release. Feel free
+to add your changes here when sending pull requests. Also send corrections if
+you spot any mistakes.
+
+## 0.3.0 (2013-XX-XX)
+
+* Feature: Add `Datagram\Socket::end()` method which closes the socket as soon
+as the remaining outgoing buffer has been sent.
+* Fix: Actually close underlying socket descriptor in `Datagram\Socket::close()`.
+
+## 0.2.0 (2013-04-16)
+
+* BC break: Whole new API, adapted to nodejs's Socket.dgram API.
+* BC break: Unified `Datagram\Socket` instead of `Datagram\Client` and `Datagram\Server`
+* Support react v0.3
+
+## 0.1.0 (2013-01-21)
+
+* First tagged release
+