Spine json "deform" key is empty

[selimanac]

deform must contain "default" when converting to spine json using 'db2 -t spine'.
This line cause this issue:

Tools/src/format/dragonBonesFormat.ts

Line 1508 in e212bef

skin: string = ""; // Deprecated.

It should be skin: string = "default";

"deform": {
    "": {
          "Head Default": {
               "Head Default": [

Like this:

"deform": {
    "default": {
          "Head Default": {
                "Head Default": [