Added Changelog

Changelog.rst

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+Change Log
+=============
+
+0.4.0
+------
+
+Changes
+________
+
+* Implemented SCP send and recv methods, all versions.
+* Conditional compilation of features requiring newer versions of libssh2.
+* Implemented channel receive window adjust, x11_*, poll and handle extended data methods.
+* Implemented session get/set blocking, get/set timeout.
+* Updated agent connection error exception name.
+* Renamed session method name to match libssh2.
+* Info extension classes for SCP file stat structure.
+
+
+0.3.1
+------
+
+Changes
+_________
+
+* Added context manager to SFTP handle
+* Implemented SFTP write, seek, stat, fstat and last_error methods.
+* Implemented SFTPAttribute object creation and de-allocation - added unit test.
+
+
+0.3.0
+--------
+
+Changes
+________
+
+* Updated API
+* Updated session, channel, agent and pkey to accept any string type arguments.
+* Added get_exit_signal implementation for channel.