drop support for Python 3.6 #130

	name: code-style

	on:
	push:
	branches:
	- master
	pull_request:
	branches:
	- develop
	- master

	jobs:

	catalyst-check-codestyle:
	runs-on: ubuntu-latest
	strategy:
	fail-fast: false
	matrix:
	python-version: ['3.8']
	timeout-minutes: 15

	steps:
	- uses: actions/checkout@v2
	- name: Set up Python
	uses: actions/setup-python@v2
	with:
	python-version: ${{ matrix.python-version }}

	- name: Install poetry
	run: \|
	pip install -U pip
	curl -sSL "https://install.python-poetry.org" \| python - --version 1.5.1
	echo "${HOME}/.poetry/bin" >> $GITHUB_PATH
	- name: Set up cache
	uses: actions/cache@v2
	with:
	path: .venv
	key: venv-ubuntu-latest-${{ matrix.python-version }}-${{ hashFiles('poetry.lock') }}
	- name: Install dependencies
	run: \|
	poetry config virtualenvs.in-project true
	poetry run pip install -U pip
	poetry install --with codestyle

	- name: check codestyle
	run: \|
	poetry run catalyst-check-codestyle --line-length 99 `find . -not -path './.venv/' -name '.py'`
	poetry run doc8 -q --file-encoding utf-8 -- docs

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