Add issue48 to release note

Author: duhenglucky

1.0.0-alpha-release-note.md

@@ -29,5 +29,5 @@ lambda style.
 [ISSUE-40](https://github.com/openmessaging/openmessaging-java/issues/40) Add boolean type to KeyValue.       
 [ISSUE-41](https://github.com/openmessaging/openmessaging-java/issues/41) Fix KeyValue short type.    
 [ISSUE-42](https://github.com/openmessaging/openmessaging-java/issues/42) Add cancel method in the Future class.     
-[ISSUE-43](https://github.com/openmessaging/openmessaging-java/issues/43) Add ACCOUNT_KEY default field to OMSBuiltinKeys.   
- 
+[ISSUE-43](https://github.com/openmessaging/openmessaging-java/issues/43) Add ACCOUNT_KEY default field to OMSBuiltinKeys.     
+[ISSUE-48](https://github.com/openmessaging/openmessaging-java/issues/48) A new MessageReceipt interface is introduced.