.group: replace `seconds` param by `interval` #215

	name: typing

	on:
	push:
	paths:
	- 'streamable/**'
	- 'tests/**'

	jobs:
	mypy:
	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v1
	- name: Set up Python 3.8
	uses: actions/setup-python@v1
	with:
	python-version: 3.8

	- name: mypy
	run: \|
	python -m pip install -r requirements-dev.txt
	python -m mypy streamable tests

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