Fix CI

.gitlab-ci.yml

@@ -5,6 +5,7 @@ stages:
 # only cache local items.
 variables:
   PIP_CACHE_DIR: "$CI_PROJECT_DIR/.cache/pip"
+  AIOHTTP_NO_EXTENSIONS: 1
 cache:
   paths:
     - .cache
@@ -13,7 +14,7 @@ black:
   stage: linting
   image: python:3
   before_script:
-    - pip3 install -U pip wheel pretix black
+    - pip3 install -U pip pretix black
   script:
     - black --check .