Update README.md

Change history is added.

Author: mahendya1002

README.md

@@ -178,6 +178,47 @@ Retry Pattern allows to retry sending a failed request and it will only work wit
     9. org.mockito:mockito-all:1.10.19
       Mock objects library for java  
 
+## Changes
+
+Version Cybersource-sdk-java 6.2.5(TBD)
+_______________________________
+  1) Merchant cert to be read from JAVA key store. Flag is added to enable reading cert from Java keystore.
+  2) Added Custom HttpClient feature. Merchants can use there own http client instead of defaults which comes with SDK.
+  3) Http Client connection reuse issue.
+  4) Changed clientLibrary version to 6.2.5, in 6.2.4 release it was missed. So, in 6.2.4 release, clientLibrary version was      pointing to 6.2.3.
+  
+Version Cybersource-sdk-java 6.2.4(Dec 15, 2016)
+_______________________________
+  1) RetryPattern config for http client.
+  2) Code review comments.
+  3) Added timers to log the method execution time.
+  4) Sample added to support other services.
+  
+Version Cybersource-sdk-java 6.2.3(Oct 17, 2016)
+_______________________________
+  1) Fixed performance issue, In case of multiple merchantIDs, p12 was getting loaded for every request.
+  2) p12 will be loaded once per merchantId.
+
+Version Cybersource-sdk-java 6.2.2(Sep 15, 2016)
+_______________________________
+  1)Upgraded 3rd party dependencies jars including wss4j.
+
+Version Cybersource-sdk-java 6.2.1(Aug 4, 2016)
+_______________________________
+  1) AkamaiSureroute config parameter introduced
+  2) i18n fix for NVP sample.            
+  3) In Sample/cybs.properties file, targetAPIVersion changed to latest 1.129.
+
+Version Cybersource-sdk-java 6.2.0(Jul 28, 2016)
+_______________________________
+  1) MLE[Message Level Encryption] is enabled.
+  2) published zip file with samples and packaged compiled cybersoruce-sdk-java jar file.
+  3) Bouncycastle jar issue, changed scope from provided to default"scope"
+
+Version Cybersource-sdk-java 6.1.0(Feb 24,2016)
+_______________________________
+  1) SHA256 changes which is required to signed the request with SHA256.
+
 ## Documentation
 - For more information about CyberSource services, see <http://www.cybersource.com/developers/documentation>.
 - For all other support needs, see <http://www.cybersource.com/support>.