Bump to v11 prerelease

Author: JaffaKetchup

pubspec.yaml

@@ -1,7 +1,7 @@
 name: flutter_map_tile_caching
 description: Plugin for 'flutter_map' providing advanced caching functionality,
   with ability to download map regions for offline use.
-version: 11.0.0-dev.1
+version: 11.0.0-dev.2
 
 repository: https://github.com/JaffaKetchup/flutter_map_tile_caching
 issue_tracker: https://github.com/JaffaKetchup/flutter_map_tile_caching/issues