Update CHANGELOG.md

Update change log with correct PR number.

Author: karenzone

CHANGELOG.md

@@ -1,6 +1,6 @@
 ## 4.1.9
  - Added configuration information for multiple s3 outputs to documentation [#196](https://github.com/logstash-plugins/logstash-output-s3/pull/196)
- - Fixed formatting problems and typographical errors [#194](https://github.com/logstash-plugins/logstash-output-s3/pull/194), [#201](https://github.com/logstash-plugins/logstash-output-s3/pull/201), and [#201](https://github.com/logstash-plugins/logstash-output-s3/pull/201)
+ - Fixed formatting problems and typographical errors [#194](https://github.com/logstash-plugins/logstash-output-s3/pull/194), [#201](https://github.com/logstash-plugins/logstash-output-s3/pull/201), and [#204](https://github.com/logstash-plugins/logstash-output-s3/pull/204)
 
 ## 4.1.8
  - Add support for setting mutipart upload threshold [#202](https://github.com/logstash-plugins/logstash-output-s3/pull/202)