gleam format on gleam nightly

Author: inoas

src/gleam/map.gleam

@@ -19,7 +19,10 @@ if javascript {
 /// See [the Erlang map module](https://erlang.org/doc/man/maps.html) for more
 /// information.
 ///
-pub external type Map(key, value)
+pub external type Map(
+  key,
+  value,
+)
 
 /// Determines the number of key-value pairs in the map.
 /// This function runs in constant time and does not need to iterate the map.