Add `u` as alias for `u3` gate. Required for compatibility with OpenQASM 2. #480

	# This workflow will install Python dependencies, run tests and lint with a variety of Python versions
	# For more information see: https://help.github.com/actions/language-and-framework-guides/using-python-with-github-actions

	name: Python package

	on:
	push:
	branches: [ master ]
	pull_request:
	branches: [ master ]

	jobs:
	build:

	runs-on: ubuntu-latest
	strategy:
	matrix:
	python-version: ["3.8", "3.9", "3.10"]
	steps:
	- uses: actions/checkout@v4
	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v4
	with:
	python-version: ${{ matrix.python-version }}
	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	pip install mypy==1.5.1
	if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
	if [ -f test_requirements.txt ]; then pip install -r test_requirements.txt; fi
	- name: mypy
	run: \|
	mypy pyzx/ tests/
	- name: Test with unittest
	run: \|
	python -m unittest discover -s "tests" -t "." --verbose

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