bump tox version

.gitlab-ci.yml

@@ -7,7 +7,7 @@ stages:
   - test
   - build
 before_script:
-  - pip install tox==2.9.1
+  - pip install tox==4.5.1
 
 pep8:
   stage: check_style

tox.ini

@@ -18,8 +18,8 @@ commands =
 
 [testenv:tests]
 deps =
-    -r requirements.txt
-    -r requirements.dev.txt
+    -rrequirements.txt
+    -rrequirements.dev.txt
 basepython = python3.8
 commands =
     pytest tests/