Follow Flutter debug painting settings

 # 1.3.4
 * Fix iOS build with Swift
 * Add installation instructions in the Readme
+* Follow Flutter debug painting settings
 
 # 1.3.3
 * Fix dart lint warnings

@@ -21,6 +21,7 @@ import 'dart:io';
 import 'dart:typed_data';
 import 'dart:ui' as ui;
 
+import 'package:flutter/rendering.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter/widgets.dart';
 import 'package:pdf/pdf.dart';

@@ -19,5 +19,7 @@ part of printing;
 class PdfDoc extends Document {
   /// Wrapper for a [Document] with zlib compression enabled by default
   PdfDoc({bool compress = true})
-      : super(deflate: compress ? zlib.encode : null);
+      : super(deflate: compress ? zlib.encode : null) {
+    Document.debug = debugPaintSizeEnabled;
+  }
 }