bump version to 0.8.0-SNAPSHOT (#2660)
bump version to 0.8.0-SNAPSHOT (#2660)

* bump version to 0.8.0-SNAPSHOT

* add core link update

intel-analytics/BigDL,yangw1234/BigDL,intel-analytics/BigDL,intel-analytics/BigDL,yangw1234/BigDL,yangw1234/BigDL,yangw1234/BigDL,intel-analytics/BigDL