#10019: Fix regression relative to 2.6: add newlines if indent=0

Patch by Amaury Forgeot d'Arc, updated by Sando Tosi.
diff --git a/Misc/NEWS b/Misc/NEWS
index b80bd52..af8fb29 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -51,6 +51,9 @@
 Library
 -------
 
+- Issue #10019: Fixed regression in json module where an indent of 0 stopped
+  adding newlines and acted instead like 'None'.
+
 - Issue #5162: Treat services like frozen executables to allow child spawning
   from multiprocessing.forking on Windows.