Update Dockerfile

Dockerfile

@@ -6,7 +6,7 @@ RUN apt-get update && apt-get install -y \
     privoxy \
     && apt-get clean
 
-RUN sed -i 's/^listen-address.*/listen-address  127.0.0.1:7680/' /etc/privoxy/config \
+RUN sed -i 's/^listen-address.*/listen-address  127.0.0.1:7860/' /etc/privoxy/config \
     && sed -i 's/^logfile.*/logfile \/dev\/stdout/' /etc/privoxy/config \
     && sed -i 's/^debug.*/debug   1/' /etc/privoxy/config