Merge pull request #1103 from nick-zh/adjust-librdkafka-docker

use supported librdkafka version of ext

Author: makasim

docker/Dockerfile

@@ -20,7 +20,7 @@ RUN set -x && \
     mkdir -p $HOME/librdkafka && \
     cd $HOME/librdkafka && \
     git clone https://github.com/edenhill/librdkafka.git . && \
-    git checkout v0.11.1 && \
+    git checkout v0.11.6 && \
     ./configure && make && make install && \
     pecl install rdkafka && \
     echo "extension=rdkafka.so" > /etc/php/7.2/cli/conf.d/10-rdkafka.ini && \