Restore linter

Author: SweetVishnya

.github/workflows/main.yml

@@ -11,8 +11,8 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
-      # - name: Python code style linter
-      # - uses: wemake-services/wemake-python-styleguide@0.16.0
+    - name: Python code style linter
+      uses: wemake-services/wemake-python-styleguide@master
     - name: Build
       run: |
           python2 -m pip install --upgrade setuptools wheel