* Adds generatorLanguageVersion and uses it in python generators
* Regenerates docs
* Adds stability to generator docs
* Triple braces generatorLanguageVersion
* Regenerates samples
* Fixes the python-experimental setup.py file so it works with generatorLanguageVersion
* Updates generators readme
* Remove redundant encoding definitions
UTF-8 is already the default encoding in Python 3.
* Remove Python3.4 related requirements
* Remove dead Python version 3.5
* Add Python 3.9 to CI and test configs
* Update petstore example
* python->python-legacy, python-experimental->python
* test with openjdk8
* test with openjdk11
* comment out rm
* move kotlin tests to circleci
* move kotlin tests
* move tests to circleci
* fix circleci
* rearrange test
* move tests
* use wrapper
Co-authored-by: Justin Black <justin.a.black@gmail.com>