RELEASE-NOTES: updated for 1.3.0

RELEASE-NOTES

@@ -2,16 +2,18 @@ libssh2 1.3.0
 
 This release includes the following changes:
 
- o 
+ o Added custom callbacks for performing low level socket I/O
 
 This release includes the following bugfixes:
 
- o 
-
+ o sftp_read: advance offset correctly for buffered copies
+ o libssh2_sftp_seek64: flush packetlist and buffered data
+ o _libssh2_packet_add: adjust window size when truncating
+ o sftp_read: a short read is not end of file
 
 This release would not have looked like this without help, code, reports and
 advice from friends like these:
 
- 
+ Henrik Nordstrom, liuzl, Guenter Knauf
  
         Thanks! (and sorry if I forgot to mention someone)