Fix clang-format: add newlines

Author: PauLopNun

src/main/java/com/thealgorithms/sorts/PostmanSort.java

@@ -42,4 +42,4 @@ private <T extends Comparable<T>> void postmanSort(T[] array) {
             }
         }
     }
-}
+}

src/test/java/com/thealgorithms/sorts/PostmanSortTest.java

@@ -5,4 +5,4 @@ public class PostmanSortTest extends SortingAlgorithmTest {
     SortAlgorithm getSortAlgorithm() {
         return new PostmanSort();
     }
-}
+}