v1.0.0

Migrated to NullSafety [more]

Following the Flutter 2.0, this package has been migrated to Null Safety

Removed rxdart dependency.

Now, the content from rxdart is migrated to local, on the folder rxdart.
This prevents incompatibilities between the version of rxdart in the project and the package.

Deprecated searchHint field.

Use 'hintText' property from searchBoxDecoration