Update version 9.15.3 -> 9.15.4

Author: semantic-release-bot

.bumpversion.cfg

@@ -1,5 +1,5 @@
 [bumpversion]
-current_version = 9.15.3
+current_version = 9.15.4
 commit = True
 message = Update version {current_version} -> {new_version}
 

README.md

@@ -4,12 +4,12 @@
 [![semantic-release](https://img.shields.io/badge/%20%20%F0%9F%93%A6%F0%9F%9A%80-semantic--release-e10079.svg)](https://github.com/semantic-release/semantic-release)
 [![CLA assistant](https://cla-assistant.io/readme/badge/ibm/java-sdk-core)](https://cla-assistant.io/ibm/java-sdk-core)
 
-# IBM Java SDK Core Version 9.15.3
+# IBM Java SDK Core Version 9.15.4
 This project contains core functionality required by Java code generated by the IBM Cloud OpenAPI SDK Generator
 (openapi-sdkgen).
 
 ## Installation
-The current version of the project: 9.15.3
+The current version of the project: 9.15.4
 
 You can use this project by defining it as a dependency within your Java SDK project
 (i.e. a project containing Java code generated by the IBM Cloud OpenAPI SDK Generator).
@@ -19,14 +19,14 @@ You can use this project by defining it as a dependency within your Java SDK pro
 <dependency>
 	<groupId>com.ibm.cloud</groupId>
 	<artifactId>sdk-core</artifactId>
-	<version>9.15.3</version>
+	<version>9.15.4</version>
 </dependency>
 ```
 
 ##### Gradle
 
 ```gradle
-'com.ibm.cloud:sdk-core:9.15.3'
+'com.ibm.cloud:sdk-core:9.15.4'
 ```
 
 ## Prerequisites