possible fix

Author: Pablo Lopez

src/kinetic.erl

@@ -272,15 +272,17 @@ execute(Operation, Payload, Opts) ->
                         #{"content-type" => "application/x-amz-json-1.1",
                           "connection" => "keep-alive"},
                     Headers =
-                        awsv4:headers(AwsCreds,
-                                      #{service => "kinesis",
-                                        target_api => Target,
-                                        method => "POST",
-                                        region => Region,
-                                        host => Host,
-                                        signed_headers => SignedHeaders,
-                                        aws_date => Date},
-                                      iolist_to_binary(Body)),
+                        [{Key, iolist_to_binary(Value)}
+                         || {Key, Value}
+                                <- awsv4:headers(AwsCreds,
+                                                 #{service => "kinesis",
+                                                   target_api => Target,
+                                                   method => "POST",
+                                                   region => Region,
+                                                   host => Host,
+                                                   signed_headers => SignedHeaders,
+                                                   aws_date => Date},
+                                                 iolist_to_binary(Body))],
                     case hackney:post(Url,
                                       Headers,
                                       Body,