Xdis

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- PR 73 from mitre:
Allow an alternate opmap - adds the capability to disassemble python bytecode that has
been frozen with a custom opcode mapping. This is particularly useful for disassembling
malware that uses custom opcode mappings in an attempt to hinder disassembly with standard
tools. The updates in this pull request are used by pydecipher, a tool to unfreeze and deobfuscate frozen python code.

- Add Python versions 3.8.8 and 3.9.2

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* Add Python 3.8.7

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* Add Python 3.9.1

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* Add support for Python2.7 on Ubuntu 20.04
* Bump versions for Python 3.8.6 and 3.5.10
* Release instructions moved to wiki
* `VERSION` -> `__version__` because Python prefers it that way

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* Add python versions 3.6.12, 3.7.9
* extended arg disassembly handling for `LOAD_ATTR` and `STORE_ATTR`

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* Add versions 3.8.5, 3.7.8, and 3.6.11
* Clarify changes to 3.8 `ROT_FOUR`
* Update 3.9 magics and opcodes