Fixed some brace unmatch problems in README

Author: guoyingtao

README.md

@@ -212,7 +212,6 @@ storage.async.setObject("Oslo", forKey: "my favorite city") { result in
       print("saved successfully")
     case .error(let error):
       print(error)
-    }
   }
 }
 
@@ -222,7 +221,6 @@ storage.async.object(ofType: String.self, forKey: "my favorite city") { result i
       print("my favorite city is \(city)")
     case .error(let error):
       print(error)
-    }
   }
 }
 
@@ -238,6 +236,7 @@ storage.async.removeAll() { result in
       print("removal completes")
     case .error(let error):
       print(error)
+  }
 }
 
 storage.async.removeExpiredObjects() { result in
@@ -246,6 +245,7 @@ storage.async.removeExpiredObjects() { result in
       print("removal completes")
     case .error(let error):
       print(error)
+  }
 }
 ```