Update index.ts

Author: Almenon

index.ts

@@ -135,6 +135,7 @@ export class PythonShell extends EventEmitter{
         this.mode = options.mode || 'text';
         this.formatter = resolve('format', options.formatter || this.mode);
         this.parser = resolve('parse', options.parser || this.mode);
+        // We don't expect users to ever format stderr as JSON so we default to text mode
         this.stderrParser = resolve('parse', options.stderrParser || 'text');
         this.terminated = false;
         this.childProcess = spawn(pythonPath, this.command, options);