Update Readme to point to the right images

@@ -8,7 +8,7 @@ This library is divided in two parts:
 It can create a full multi-pages document with graphics,
 images and text using TrueType fonts. With the ease of use you already know.
 
-![Example document](example.jpg)
+<img alt="Example document" src="https://raw.githubusercontent.com/DavBfr/dart_pdf/master/pdf/example.jpg">
 
 > Use the `printing` package <https://pub.dartlang.org/packages/printing>
 > for full flutter print and share operation.

@@ -5,7 +5,7 @@ documents to android or ios compatible printers
 
 See the example on how to use the plugin.
 
-<img alt="Example document" src="example.png" width="300">
+<img alt="Example document" src="https://raw.githubusercontent.com/DavBfr/dart_pdf/master/printing/example.png" width="300">
 
 > This plugin uses the `pdf` package <https://pub.dartlang.org/packages/pdf>
 > for pdf creation. Please refer to <https://pub.dartlang.org/documentation/pdf/latest/>