Run tests on python 3.10 (#61)

* Run tests on python 3.10

* Use quotes maybe?

* aiohttp less than 4

* minimum python 3.8

.github/workflows/tests.yaml

@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.6, 3.7, 3.8, 3.9]
+        python-version: [3.8, 3.9, '3.10']
 
     steps:
     - uses: actions/checkout@v2

setup.py

@@ -15,7 +15,7 @@
     url="https://github.com/squishykid/solax",
     packages=setuptools.find_packages(exclude=['tests', 'tests.*']),
     install_requires=[
-        'aiohttp>=3.5.4',
+        'aiohttp>=3.5.4, <4',
         'voluptuous>=0.11.5'
     ],
     setup_requires=[
@@ -26,4 +26,5 @@
         "License :: OSI Approved :: MIT License",
         "Operating System :: OS Independent",
     ],
+    python_requires='>=3.8',
 )