Update pending change log for PR and
Adds PR and to the pending change log.
### SDK Features
### SDK Enhancements
+* `private/protocol/restjson/restjson`: Use json.Decoder to decrease memory allocation (#2141)
+ * Update RESTJSON protocol unmarshaler to use json.Decoder instead of ioutil.ReadAll to reduce allocations.
+* `private/protocol/jsonrpc/jsonrpc`: Use json.Decoder to decrease memory allocation (#2142)
+ * Update JSONPRC protocol unmarshaler to use json.Decoder instead of ioutil.ReadAll to reduce allocations.
### SDK Bugs
