Add SCRIPT SHOW cmd (#188)

Author: shohamazon

redis/src/cluster_routing.rs

@@ -526,6 +526,7 @@ fn base_routing(cmd: &[u8]) -> RouteBy {
         | b"READONLY"
         | b"READWRITE"
         | b"SAVE"
+        | b"SCRIPT SHOW"
         | b"TFCALL"
         | b"TFCALLASYNC"
         | b"TFUNCTION DELETE"
@@ -732,6 +733,7 @@ pub fn is_readonly_cmd(cmd: &[u8]) -> bool {
             | b"SCRIPT FLUSH"
             | b"SCRIPT KILL"
             | b"SCRIPT LOAD"
+            | b"SCRIPT SHOW"
             | b"SDIFF"
             | b"SINTER"
             | b"SINTERCARD"