[version bump] 1.6.0

[suyashcjoshi]

Updated PyTorch Android and TorchVision dependency vision to 1.6.0 that fixed the runtime error for this HelloWorldApp regarding the model version.

[suyashcjoshi]

This PR fixes this bug : #79

[jeremiahschung]

This happens because trace_model.py builds/saves a new version of model.pt with the torch library that's installed locally. Hence if you have PyTorch 1.6 installed, the model file would have been built with 1.6 and cannot be loaded with 1.4.

If you pull the code from the repo again (so that model.pt is also pulled) and directly run the app, it should work.

This solution works, but we'll need to update it every time a new version of PyTorch is released. A preferred fix would be to update the documentation (https://github.com/pytorch/android-demo-app/blob/master/README.md) to include an explanation to update the android PyTorch dependency version to match your local PyTorch version.

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