Update docker-gen to 0.7.4

Dockerfile

@@ -18,7 +18,7 @@ RUN echo "daemon off;" >> /etc/nginx/nginx.conf \
 ADD https://github.com/jwilder/forego/releases/download/v0.16.1/forego /usr/local/bin/forego
 RUN chmod u+x /usr/local/bin/forego
 
-ENV DOCKER_GEN_VERSION 0.7.3
+ENV DOCKER_GEN_VERSION 0.7.4
 
 RUN wget https://github.com/jwilder/docker-gen/releases/download/$DOCKER_GEN_VERSION/docker-gen-linux-amd64-$DOCKER_GEN_VERSION.tar.gz \
  && tar -C /usr/local/bin -xvzf docker-gen-linux-amd64-$DOCKER_GEN_VERSION.tar.gz \

Dockerfile.alpine

@@ -15,7 +15,7 @@ RUN echo "daemon off;" >> /etc/nginx/nginx.conf \
 ADD https://github.com/jwilder/forego/releases/download/v0.16.1/forego /usr/local/bin/forego
 RUN chmod u+x /usr/local/bin/forego
 
-ENV DOCKER_GEN_VERSION 0.7.3
+ENV DOCKER_GEN_VERSION 0.7.4
 
 RUN wget --quiet https://github.com/jwilder/docker-gen/releases/download/$DOCKER_GEN_VERSION/docker-gen-alpine-linux-amd64-$DOCKER_GEN_VERSION.tar.gz \
  && tar -C /usr/local/bin -xvzf docker-gen-alpine-linux-amd64-$DOCKER_GEN_VERSION.tar.gz \