bump version to 0.8.0

Merge remote-tracking branch 'origin/master'

Merge pull request #276 from arogozhnikov/torch-dynamic-compile

bump version

Merge pull request #266 from arogozhnikov/release-070rc1

release 0.7.0rc1, highlight changes in README

change version to 0.6.2rc

bump version 0.6.0 -> 0.6.1

Merge pull request #224 from arogozhnikov/packing

Preparations for 0.6.0 release

minor

bump version

update versions for release 0.4.0