update version

CHANGELOG.md

+## 1.1.0-pre
+
+- fix bucketExists is true when bucket doesn't exist #13
+
+
+## 1.0.2-pre
+
+- Replace static region 'us-east-1' in method listBuckets() with variable's value
+
 ## 1.0.1-pre
 
 - Updated dependencies

pubspec.yaml

 name: minio
 description: Unofficial MinIO Dart Client SDK that provides simple APIs to access any Amazon S3 compatible object storage server.
-version: 1.0.1-pre
+version: 1.1.0-pre
 homepage: https://github.com/xtyxtyx/minio-dart
 issue_tracker: https://github.com/xtyxtyx/minio-dart/issues