feat: add an isTTY check

This prevents the code from having a negative impact on piped stdio.

Refs: nodejs/node#6456 (comment)
Refs: nodejs/node#1771 (comment)

index.js

@@ -1,6 +1,6 @@
 module.exports = function (blocking) {
   [process.stdout, process.stderr].forEach(function (stream) {
-    if (stream._handle && typeof stream._handle.setBlocking === 'function') {
+    if (stream._handle && stream.isTTY && typeof stream._handle.setBlocking === 'function') {
       stream._handle.setBlocking(blocking)
     }
   })