update document

CONTRIBUTING.md

@@ -37,7 +37,7 @@ We really appreciate contributions via GitHub pull requests. To contribute take
  * Apply your changes
  * Verify your changes and fix potential warnings/ errors:
    * Check formatting: `flutter format .`
-   * Run static analyses: `flutter analyzes`
+   * Run static analyses: `flutter analyze`
    * Run unit-tests: `flutter test`
  * Commit your changes: `git commit -am "<your informative commit message>"`
  * Push changes to your fork: `git push origin <name_of_your_branch>`

README.md

@@ -169,6 +169,10 @@ enum PermissionGroup {
   /// Android: None
   /// iOS: MPMediaLibrary
   mediaLibrary
+
+  /// Android: Check notification enable
+  /// iOS: Check and request notification permission
+  notification
 }
 ```