Release v0.6.0

set version to v0.6.0

Fix possible incomplete output stream

v0.5.0

flush and close out stream

Fix possible deadlock

v0.4.0

set version to v0.4.0

Reduce CPU loading

v0.3.0

set version to v0.3.0

Fix memory leak

v0.2.0

set default compression level to 6

First release

v0.1.0

fix linux compilation issue