8.3 release (apple#2492)

* 8.3 release

* Disable flake8 + Fix external CI

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Co-authored-by: Gitesh  Dawer <[email protected]>

8.0b2 Release (apple#2308)

6.1 Release (apple#1675)

6.1 Release

Merge pull request apple#584 from 1duo/master

Mark coremltools 3.2

Merge pull request apple#512 from 1duo/master

sync and update version number

Merge pull request apple#472 from aseemw/dev/coremltools_3.0_release

3.0 release

Merge pull request apple#444 from aseemw/dev/coremltools_3_0_release

3.0b6 release

Merge pull request apple#444 from aseemw/dev/coremltools_3_0_release

3.0b6 release

Merge pull request apple#362 from Necross/coremltools3.0b

Consolidating changes for coremltools3.0 beta release

Merge pull request apple#322 from aseemw/dev/release_2.1

Update version to 2.1