chore(deps): Make sure aiohttp >= 2.3.2

To avoid this bug on some machines:

    Traceback (most recent call last):
        [...]
        web.run_app(app, sock=sock, access_log=logger)
        [...]
        host, port = sock.getsockname()
    ValueError: too many values to unpack (expected 2)

See a better description at
aio-libs/aiohttp#2431

setup.py

@@ -34,7 +34,7 @@
         'localstripe': ['fake-stripe-v3.js'],
     },
     install_requires=[
-        'aiohttp >=2.3.0',
+        'aiohttp >=2.3.2',
         'python-dateutil >=2.6.1',
     ],
 )