update CHANGELOG

CHANGELOG.md

+## 0.1.3
+
+- support presignedGetObject and presignedPutObject
+
 ## 0.1.2
 
 - support presignedUrl

pubspec.yaml

 name: minio
 description: Unofficial MinIO Dart Client SDK that provides simple APIs to access any Amazon S3 compatible object storage server.
-version: 0.1.2
+version: 0.1.3
 homepage: https://github.com/xtyxtyx/minio-dart
 issue_tracker: https://github.com/xtyxtyx/minio-dart/issues