fix: redirect help (#1825)

Fixes: #1807

Allows for nodemon --help > help.txt

Author: remy

lib/nodemon.js

@@ -39,7 +39,9 @@ function nodemon(settings) {
   }
 
   if (settings.help) {
-    process.stdout._handle.setBlocking(true); // nodejs/node#6456
+    if (process.stdout.isTTY) {
+      process.stdout._handle.setBlocking(true); // nodejs/node#6456
+    }
     console.log(help(settings.help));
     if (!config.required) {
       process.exit(0);