remove duplicated version attribute #97

	name: Build docs

	on:
	push:
	branches:
	- main

	jobs:
	build:
	runs-on: [ubuntu-latest]
	steps:
	- uses: actions/checkout@v2
	with:
	submodules: 'true'

	- name: Set up Python 3.7
	uses: actions/setup-python@v1
	with:
	python-version: 3.7

	- name: Install dependencies
	run: \|
	python -m pip install Sphinx sphinx_rtd_theme
	python -m pip install .
	- name: Build Site
	run: make html

	- name: Deploy Site
	uses: peaceiris/actions-gh-pages@v3
	with:
	github_token: ${{ secrets.GITHUB_TOKEN }}
	publish_dir: ./build/html

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