Fix PdfPreview timer dispose

 # Changelog
 
+## 5.0.5
+
+- Fix PdfPreview timer dispose [wwl901215]
+
 ## 5.0.4
 
 - Improve console error reporting

@@ -240,6 +240,12 @@ class _PdfPreviewState extends State<PdfPreview> {
   }
 
   @override
+  void dispose() {
+    previewUpdate?.cancel();
+    super.dispose();
+  }
+
+  @override
   void reassemble() {
     _raster();
     super.reassemble();

@@ -7,7 +7,7 @@ description: >
 homepage: https://github.com/DavBfr/dart_pdf/tree/master/printing
 repository: https://github.com/DavBfr/dart_pdf
 issue_tracker: https://github.com/DavBfr/dart_pdf/issues
-version: 5.0.4
+version: 5.0.5
 
 environment:
   sdk: ">=2.12.0-0 <3.0.0"