Bump version to 0.21.0

Replace space with dash in tensorflow-sys-runtime keywords

Merge pull request #376 from adamcrume/master

Update zip dependency version and crate version

Merge pull request #372 from adamcrume/master

Bump tensorflow-internal-macros to 0.0.3

Merge pull request #352 from adamcrume/master

Update generated eager ops for TensorFlow 2.8

[eager] update

* use PhantomData to control TensorHandle lifetime
* add doc test
* update error msg for `resolve`

[lib] refactoring

Bump to version 0.17.0

Bump to version 0.16.1

Bump to version 0.16.0