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* First release on PyPI.
* add class Material2D - base class for all materials used in this package.
* add class IsotropicMaterial - Material2D class for isotropic materials.
* add class AnisotropicMaterial - Material2D class for anisotropic materials.
* add class FiberReinforcedMaterialUD - Material2D class that combines two materials.
* add class Ply - generates defined ply/layer of Material2D.
* add class Laminate - combines mulitple Ply instances to composite laminate.
* dev setup:
* add .pre-commit-config.yaml - formating with black
* changed travis - add ``black --check`` on 'before_script' method
* changed requirements_dev.txt
* add requirements.txt
* add tests for classes
* fix tox python 3.8 and flake8 checking
* add flake8 ignore: E501, W503, F841
* update mail adress
* docs:
* changed usage.rst - new Version update to use package