Add importerror if gevent specified but not installed. #98

	name: Tests
	on: [push]
	jobs:
	tests:
	name: ${{ matrix.python-version }}
	runs-on: ubuntu-20.04
	services:
	redis:
	image: redis
	ports:
	- 6379:6379
	kyototycoon:
	image: coleifer/kyototycoon
	ports:
	- 1978:1978
	strategy:
	fail-fast: false
	matrix:
	python-version: [3.7, 3.8, "3.10", "3.11"]
	steps:
	- uses: actions/checkout@v2
	- uses: actions/setup-python@v2
	with:
	python-version: ${{ matrix.python-version }}
	- name: pip deps
	run: pip install gevent redis peewee ukt
	- name: runtests
	env:
	HUEY_TRAVIS: '1'
	run: python runtests.py -v 2

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