we don't support py3.6; support py3.9

.travis.yml

@@ -3,7 +3,7 @@ cache: pip
 python:
   - "3.7"
   - "3.8"
-  - "3.8-dev"
+  - "3.9"
 install:
   - pip3 install mypy -r requirements.txt
 script:

requirements.txt

@@ -1,7 +1,6 @@
 anyio            ~=2.0.2
 asyncio-rlock    ~=0.1.0
 asyncio-throttle ~=1.0.1
-dataclasses      ~=0.6; python_version<"3.7"
 ircstates        ~=0.11.10
 async_stagger    ~=0.3.0
 async_timeout    ~=3.0.1

setup.py

@@ -26,6 +26,6 @@ setup(
         "Operating System :: Microsoft :: Windows",
         "Topic :: Communications :: Chat :: Internet Relay Chat"
     ],
-    python_requires='>=3.6',
+    python_requires='>=3.7',
     install_requires=install_requires
 )