Updating voltctl according to correct version value

Change-Id: I1f8f601445c387e0ccf0e6b9a10a2a36f86c7c69
diff --git a/README.md b/README.md
index 1987cd6..7b4a89e 100644
--- a/README.md
+++ b/README.md
@@ -238,7 +238,7 @@
 if [ "$HOSTARCH" == "x86_64" ]; then
     HOSTARCH="amd64"
 fi
-sudo wget https://github.com/opencord/voltctl/releases/download/v1.3.1/voltctl-1.3.1-$HOSTOS-$HOSTARCH -O /usr/local/bin/voltctl
+sudo wget https://github.com/opencord/voltctl/releases/download/v1.7.4/voltctl-1.7.4-$HOSTOS-$HOSTARCH -O /usr/local/bin/voltctl
 sudo chmod +x /usr/local/bin/voltctl
 source <(voltctl completion bash)
 ```