v1.3.6 中元节改为农历七月十五；修复Solar的nextMonth超期问题。

src/test/java/test/SolarTest.java

@@ -171,4 +171,28 @@ public class SolarTest {
     Assert.assertEquals("1582-09-29", solar.next(-6).toYmd());
   }
 
+  @Test
+  public void test27(){
+    Solar solar = Solar.fromYmd(2023, 8, 31);
+    Assert.assertEquals("2023-09-30", solar.nextMonth(1).toYmd());
+  }
+
+  @Test
+  public void test28(){
+    Solar solar = Solar.fromYmd(2023, 8, 31);
+    Assert.assertEquals("2023-10-31", solar.nextMonth(2).toYmd());
+  }
+
+  @Test
+  public void test29(){
+    Solar solar = Solar.fromYmd(2023, 8, 31);
+    Assert.assertEquals("2025-08-31", solar.nextYear(2).toYmd());
+  }
+
+  @Test
+  public void test30(){
+    Solar solar = Solar.fromYmd(2023, 8, 31);
+    Assert.assertEquals("2024-02-29", solar.nextMonth(6).toYmd());
+  }
+
 }