!42 模块：代码生成器；修复问题：修复timestamp类型的无法正确生成问题

Merge pull request !42 from Jack.Zhang/fix_codegen_timestampsupport

src/main/java/com/youlai/boot/shared/codegen/enums/JavaTypeEnum.java

@@ -28,7 +28,8 @@ public enum JavaTypeEnum {
     DOUBLE("double", "Double", "number"),
     DECIMAL("decimal", "BigDecimal", "number"),
     DATE("date", "LocalDate", "Date"),
-    DATETIME("datetime", "LocalDateTime", "Date");
+    DATETIME("datetime", "LocalDateTime", "Date"),
+    TIMESTAMP("timestamp", "LocalDateTime", "Date");
 
     // 数据库类型
     private final String dbType;