Merge pull request #290 from BestBurning/3.0

更改table.fieldNames获取只获取数据库中的字段，而不加AS转换

mybatis-plus-generator/src/main/java/com/baomidou/mybatisplus/generator/config/po/TableInfo.java

@@ -229,9 +229,9 @@ public class TableInfo {
             for (int i = 0; i < fields.size(); i++) {
                 TableField fd = fields.get(i);
                 if (i == fields.size() - 1) {
-                    names.append(cov2col(fd));
+                    names.append(fd.getName());
                 } else {
-                    names.append(cov2col(fd)).append(", ");
+                    names.append(fd.getName()).append(", ");
                 }
             }
             fieldNames = names.toString();