Remove stray dependency (#3515)

Author: Tim Sneath

packages/shared_preferences/shared_preferences_windows/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.0.2+3
+
+* Remove 'ffi' dependency.
+
 ## 0.0.2+2
 
 * Relax 'ffi' version constraint.

packages/shared_preferences/shared_preferences_windows/pubspec.yaml

@@ -1,7 +1,7 @@
 name: shared_preferences_windows
 description: Windows implementation of shared_preferences
 homepage: https://github.com/flutter/plugins/tree/master/packages/shared_preferences/shared_preferences_windows
-version: 0.0.2+2
+version: 0.0.2+3
 
 flutter:
   plugin:
@@ -18,7 +18,6 @@ dependencies:
   shared_preferences_platform_interface: ^1.0.0
   flutter:
     sdk: flutter
-  ffi: ">=0.1.3 < 0.3.0"
   file: ">=5.1.0 <7.0.0"
   meta: ^1.1.7
   path: ^1.6.4