TensorFlow Lattice 2.0.3

Changes:

• Two new tutorials: premade models, shape constraints for ML fairness
• Improvements and additions to premade models
• New range dominance for Lattice and Linear layers
• Added 'peak' mode to unimodality constraint
• Updates to documentation
• Bug fixes

PyPI release:

• Generic package for py2/py3 that should work for TF 1.15 or TF 2.x.