updating the sign file with a multiline command

sign.js

@@ -2,7 +2,9 @@ exports.default = async function(configuration) {
   console.log(`config:\n${JSON.stringify(configuration, null, 4)}`)
 
   require("child_process").execSync(
-    `azuresigntool sign --help`,
+    `azuresigntool sign \
+    --help
+    `,
     {
       stdio: "inherit"
     }