Fix Event.write to have writable = true

Signed-off-by: Edwin Török <[email protected]>

src/event.ml

@@ -5,5 +5,5 @@ type t =
 
 let read = { readable = true; writable = false }
 let none = { readable = false; writable = false }
-let write = { readable = false; writable = false }
+let write = { readable = false; writable = true }
 let read_write = { readable = true; writable = true }