Add CHANGELOG entry for pytest-dev#1223

Author: nicoddemus

CHANGELOG

@@ -15,6 +15,10 @@
 - fix #1292: monkeypatch calls (setattr, setenv, etc.) are now O(1).
   Thanks David R. MacIver for the report and Bruno Oliveira for the PR.
 
+- fix #1223: captured stdout and stderr are now properly displayed before 
+  entering pdb when ``--pdb`` is used instead of being thrown away.
+  Thanks Cal Leeming for the PR.
+
 - fix #1305: pytest warnings emitted during ``pytest_terminal_summary`` are now
   properly displayed.
   Thanks Ionel Maries Cristian for the report and Bruno Oliveira for the PR.