modify the required version of refchecker

Author: HuXiangkun

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "ragchecker"
-version = "0.1.8"
+version = "0.1.9"
 description = "RAGChecker: A Fine-grained Framework For Diagnosing Retrieval-Augmented Generation (RAG) systems."
 authors = [
     "Xiangkun Hu <[email protected]>",
@@ -15,7 +15,7 @@ license = "Apache-2.0"
 
 [tool.poetry.dependencies]
 python = "^3.9"
-refchecker = "^0.2.12"
+refchecker = "^0.2"
 loguru = "^0.7"
 dataclasses-json = "^0.6"