start on changelog for 0.4.2.5

ChangeLog

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+Changes in version 0.4.2.5 - 2019-12-??
+  Blurb blurb.
+
+  o Testing (backport from 0.4.2.5):
+    - Require C99 standards-conforming code in Travis CI, but allow GNU
+      gcc extensions. Also activates clang's -Wtypedef-redefinition
+      warnings. Build some jobs with -std=gnu99, and some jobs without.
+      Closes ticket 32500.
+
+
 Changes in version 0.4.2.4-rc - 2019-11-15
   Tor 0.4.2.4-rc is the first release candidate in its series. It fixes
   several bugs from earlier versions, including a few that would result in

changes/ticket32500

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-  o Testing:
-    - Require C99 standards-conforming code in Travis CI, but allow GNU gcc
-      extensions. Also activates clang's -Wtypedef-redefinition warnings.
-      Build some jobs with -std=gnu99, and some jobs without.
-      Closes ticket 32500.