release 0.8.0

Merge pull request microsoft#438 from microsoft/nested_decision_exe

Support Highfreq Backtest with the Model/Rule/RL Strategy

Update VERSION.txt

updategrade version number

update version for release 0.7.0

update version number

update version for releasing

Release qlib 0.6.1

Fix and move to version 0.6.0

Update python-publish.yml