enhance ilm show, add ilm update, rename modify to update everywhere (#58)

cmd/index_template.go

@@ -83,8 +83,8 @@ func IndexTemplateCreate(conf *cfg.Config, modify bool) *cli.Command {
 	required := true
 
 	if modify {
-		name = "modify"
-		alias = "mod"
+		name = "update"
+		alias = "upd"
 		required = false
 	}