✅ CircleCI: Try to fix encoding problem

.circleci/config.yml

@@ -14,7 +14,7 @@ jobs:
       - run: pip3 install -r requirements-test.txt
       - run:
           command: |
-            if [[ $(python -c "import sys; print(sys.stdin.encoding)" |grep None) ]]; then
+            if [[ $(python3 -c "import sys; print(sys.stdin.encoding)" |grep None) ]]; then
               export PYTHONIOENCODING=utf-8
             fi
             make coverage