Asn1

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* Fix 21 - Invalid decoding in non-Universal classes
* Fix 57 - Invalid encoding of non-Universal classes

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* No change in code, only in packaging and in texts (README, ...)

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* Tests: Replace nose by pytest
* Add Python 3.8, remove Python 3.4 support
* PR26 (from rumbah): Add test for default (implicit) encoding types
* PR25 (from thomwiggers): Attempt to support BIT STRING
* Fix wrong example code, see 27
* (from jcrowgey) Makes the package usable with pip install
* Remove support of Python 3.3 (some dependencies do not support 3.3)
* PR15 (from ThePlasmaRailgun) Fix parsing of object identifier
* PR10 (from robinleander): Allow user to determine decoding tagtype

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* Use "true" enums instead of classes. Use enun34 backport for old Python versions.

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* Fix a bug (9): two's complement corner case with values such as -32769. Add new test cases to test them.

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* Add more documentation
* Use (simulated) enumerations
* Add Python 2.6 in automated checks and tests
* Add type hints (for static checking) and fix some code