Tf-keras-vis

Bugfix
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* Fixes a bug that tf-keras-vis can't install on Python 3.8.x

Improvements
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* Python 3.8 are available
* Added docker-images that contains tf-keras-vis v0.2.4

Improvement
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* Add a argument to Gradcam__call__() to fix issues/4

Document issues fixes and other changes
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* Fixes examples of docker command in README.md
* Remove unnecessary comments in source

> [!NOTE]
> This release is for updating description page on PyPI, so it NOT contains any changes of library's behaviors.

Bug Fixes and Other Changes
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* In Saliency and Gradcam, support seed_input that don't have samples (batch) dimension.
* Fixes a lot of bugs
* Dockerfiles changed to tensorlfow image base.
* Added tests and .travis.yml .

Breaking Changes
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* `tf_keras_vis.utils.losses.SmoothingLoss` class renamed to `tf_keras_vis.utils.losses.SmoothedLoss`.