Update README (#1001)

### What problem does this PR solve?

_Briefly describe what this PR aims to solve. Include background context
that will help reviewers understand the purpose of the PR._

### Type of change

- [x] Documentation Update

Signed-off-by: Jin Hai <[email protected]>

README.md

@@ -52,7 +52,7 @@ Try our demo at [https://demo.ragflow.io](https://demo.ragflow.io).
 
 ## 📌 Latest Updates
 
-- 2024-05-30 Integrates [BCE](https://github.com/netease-youdao/BCEmbedding), [BGE](https://github.com/FlagOpen/FlagEmbedding), and [Colbert](https://github.com/stanford-futuredata/ColBERT) reranker models.
+- 2024-05-30 Integrates [BCE](https://github.com/netease-youdao/BCEmbedding) and [BGE](https://github.com/FlagOpen/FlagEmbedding) reranker models.
 - 2024-05-28 Supports LLM Baichuan and VolcanoArk.
 - 2024-05-23 Supports [RAPTOR](https://arxiv.org/html/2401.18059v1) for better text retrieval.
 - 2024-05-21 Supports streaming output and text chunk retrieval API. 

README_ja.md

@@ -34,7 +34,7 @@
 
 ## 📌 最新情報
 
-- 2024-05-30 [BCE](https://github.com/netease-youdao/BCEmbedding)、[BGE](https://github.com/FlagOpen/FlagEmbedding)、[Colbert](https://github.com/stanford-futuredata/ColBERT) reranker を統合。
+- 2024-05-30 [BCE](https://github.com/netease-youdao/BCEmbedding)、[BGE](https://github.com/FlagOpen/FlagEmbedding) reranker を統合。
 - 2024-05-28 LLM BaichuanとVolcanoArkを統合しました。
 - 2024-05-23 より良いテキスト検索のために[RAPTOR](https://arxiv.org/html/2401.18059v1)をサポート。
 - 2024-05-21 ストリーミング出力とテキストチャンク取得APIをサポート。

README_zh.md

@@ -33,7 +33,7 @@
 
 ## 📌 近期更新
 
-- 2024-05-30 集成 [BCE](https://github.com/netease-youdao/BCEmbedding), [BGE](https://github.com/FlagOpen/FlagEmbedding) 和 [Colbert](https://github.com/stanford-futuredata/ColBERT) 重排序模型。
+- 2024-05-30 集成 [BCE](https://github.com/netease-youdao/BCEmbedding) 和 [BGE](https://github.com/FlagOpen/FlagEmbedding) 重排序模型。
 - 2024-05-28 集成大模型 Baichuan 和火山方舟。
 - 2024-05-23 实现 [RAPTOR](https://arxiv.org/html/2401.18059v1) 提供更好的文本检索。
 - 2024-05-21 支持流式结果输出和文本块获取API。