Cosmos DB: 0.3.4 release date (Azure#20517)

Author: ealsur

sdk/data/azcosmos/CHANGELOG.md

@@ -1,16 +1,10 @@
 # Release History
 
-## 0.3.4 (Unreleased)
+## 0.3.4 (2023-04-11)
 
 ### Features Added
 * Added `NullPartitionKey` variable to create and query documents with null partition key in CosmosDB
 
-### Breaking Changes
-
-### Bugs Fixed
-
-### Other Changes
-
 ## 0.3.3 (2023-01-10)
 
 ### Features Added