Reverted header (Issue #3023)

bbbales2 · bbbales2 · commit 7d2d478955f5 · 2021-03-19T11:40:49.000-04:00
diff --git a/src/stan/mcmc/windowed_adaptation.hpp b/src/stan/mcmc/windowed_adaptation.hpp
@@ -3,7 +3,7 @@
 
 #include <stan/callbacks/logger.hpp>
 #include <stan/mcmc/base_adaptation.hpp>
-#include <iostream>
+#include <ostream>
 #include <string>
 
 namespace stan {
