Fold entries into changelog again

changes/bug18351

@@ -1,6 +0,0 @@
-  o Minor bugfixes (logging):
-    - Downgrade logs and backtraces about IP versions to
-      info-level. Only log backtraces once each time tor runs.
-      Assists in diagnosing bug 18351; bugfix on c3cc8e16e in
-      tor-0.2.8.1-alpha.
-      Reported by "sysrqb" and "Christian", patch by "teor".

changes/bug18479

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-  o Minor bugfixes (time parsing):
-    - Avoid overflow in tor_timegm when parsing dates in and after 2038
-      on platforms with 32-bit time_t.
-      Fixes bug 18479; bugfix on 3c4b4c8ca in tor-0.0.2pre14.
-      Patch by "teor".

changes/bug18489

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-  o Minor bugfixes (fallback directory mirrors):
-    - When requesting extrainfo descriptors from a trusted directory
-      server, check whether it is an authority or a fallback directory
-      which supports extrainfo descriptors.
-      Fixes bug 18489; bugfix on 90f6071d8d in tor-0.2.4.7-alpha.
-      Reported by "atagar", patch by "teor".

changes/bug18517

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-  o Major bugfixes (bridges, pluggable transports):
-    - Modify the check for OR connections to private addresses.
-      Allow bridges on private addresses, including pluggable transports
-      that ignore the (potentially private) address in the bridge line.
-      Fixes bug 18517; bugfix on 23b088907f in tor-0.2.8.1-alpha.
-      Reported by "gk", patch by "teor".