CocoaPods could not find compati

 -> shared_preferences (0.0.2)
    - WARN  | description: The description is equal to the summary.
    - ERROR | [iOS] unknown: Encountered an unknown error (CocoaPods could not find compatible versions for pod "Flutter":
  In Podfile:
    shared_preferences  was resolved to 0.0.2, which depends on
      Flutter

Specs satisfying the `Flutter` dependency were found, but they required a higher minimum deployment target.

组件shared_preferences
s.ios.deployment_target = '8.0'
组件Flutter
s.ios.deployment_target = '9.0'

修改组件shared_preferences 的deployment_target和Flutter的保持一致