Add merge(maxConcurrent:) -> flatMap(maxPublihers:)

Author: freak4pc

Data/operators.csv

@@ -38,6 +38,7 @@ just,Publishers.Just,
 map,"map, tryMap",
 materialize,❌,
 merge,"merge, tryMerge",
+merge(maxConcurrent:),flatMap(maxPublishers:),
 multicast,multicast,
 never,Publishers.Empty(completeImmediately: false),
 observeOn,receive(on:),