Merge pull request #2993 from ethereum/fix/batch-request

Error handling fixed with callbacks for BatchRequests

Author: nivida

CHANGELOG.md

@@ -82,3 +82,4 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Encryption of the V3Keystore fixed (#2950)
 - Provider timeout fixed and Maps are used now to handle subscriptions (#2955)
 - stripHexPrefix fixed (#2989)
+- BatchRequest error handling fixed for callbacks (#2993)