Update Dockerfile

Dockerfile

@@ -6,9 +6,6 @@ COPY requirements.txt .
 
 RUN pip install --no-cache-dir -r requirements.txt
 
-ENV PYTHONUNBUFFERED=1 
-ENV PYTHONIOENCODING=UTF-8 
-
 ENV CALDAV_URL $CALDAV_URL 
 ENV CALENDAR_NAME $CALENDAR_NAME 
 ENV USERNAME $USERNAME