Correct the v0.2.0 release date and link the paper DOI from Zenodo metadata

Author: harukicoder

.zenodo.json

@@ -25,6 +25,11 @@
   ],
   "language": "eng",
   "related_identifiers": [
+    {
+      "identifier": "10.5281/zenodo.22239032",
+      "relation": "isDocumentedBy",
+      "scheme": "doi"
+    },
     {
       "identifier": "https://github.com/harukicoder/hsk30",
       "relation": "isSupplementTo",

CITATION.cff

@@ -35,7 +35,7 @@ keywords:
   - controlled-generation
 license: MIT
 version: 0.2.0
-date-released: "2026-09-01"
+date-released: "2026-09-02"
 references:
   - type: data
     title: "HSK 3.0 Graded Reader Corpus"