Updated SC2034 (markdown)

SC2034.md

@@ -53,10 +53,17 @@ read _ last _ zip _ _ <<< "$str"
 echo "$last, $zip"
 ```
 
-or if you prefer to keep the names, use a directive to disable the warning:
+Or optionally as a prefix for dummy variables (ShellCheck >0.7.2).
+
+``` ​
+read _first last _email zip _lat _lng <<< "$str"
+echo "$last, $zip"
+```
+
+For versions <= 0.7.2, the message can optionally be [[ignore]]d with a directive:
 
 ```sh
 # shellcheck disable=SC2034  # Unused variables left for readability
 read first last email zip lat lng <<< "$str"
 echo "$last, $zip"
-```
+``