Update Dockerfile

Author: fedacking

clients/ethrex/Dockerfile

@@ -20,8 +20,7 @@ ADD enode.sh /hive-bin/enode.sh
 RUN chmod +x /hive-bin/enode.sh
 
 # Create version.txt
-# RUN /usr/local/bin/ethrex --version | sed -e 's/ethrex \(.*\)/\1/' > /version.txt
-RUN echo "ethrex/0.1.0" > /version.txt
+RUN ethrex --version | sed -e 's/ethrex \(.*\)/\1/' > /version.txt
 
 # Export the usual networking ports to allow outside access to the node.
 EXPOSE 8545 8546 30303 30303/udp