message: Fix Promise signature
diff: @@ -456,11 +456,11 @@ export interface NextSignature<P, R> {
  }
  export interface DidChangeConfigurationSignature {
  - (this: void, sections: string[] | undefined): void;
  + (this: void, sections: string[] | undefined): Promise<void>;
  }
  export interface DidChangeWatchedFileSignature {
  - (this: void, event: FileEvent): void;
  + (this: void, event: FileEvent): Promise<void>;
  }
  export interface _WorkspaceMiddleware {
  