add newline

Author: iamcodinghere22

src/main/java/com/thealgorithms/maths/SquareFreeInteger.java

@@ -31,4 +31,4 @@ public static boolean isSquareFree(int num) {
         }
         return true;
     }
-}
+}

src/main/java/com/thealgorithms/maths/SquareFreeIntegerTest.java

@@ -31,4 +31,4 @@ void testInvalidInput() {
         assertThrows(IllegalArgumentException.class, () -> SquareFreeInteger.isSquareFree(0));
         assertThrows(IllegalArgumentException.class, () -> SquareFreeInteger.isSquareFree(-5));
     }
-}
+}