update README.md

RuoYi

2021-01-14 cca2f5c62ddb9539bceae1f5a92386389e24a5b3

 ruoyi-common/src/main/java/com/ruoyi/common/constant/GenConstants.java

@@ -13,6 +13,9 @@
    /** 树表（增删改查） */

    public static final String TPL_TREE = "tree";



    /** 主子表（增删改查） */

    public static final String TPL_SUB = "sub";



    /** 树编码字段 */

    public static final String TREE_CODE = "treeCode";