remove changes files that are also in 0.2.8.8

changes/bug20103

@@ -1,7 +0,0 @@
-  o Major bugfixes (crash):
-
-    - Fix a complicated crash bug that could affect Tor clients
-      configured to use bridges when replacing a networkstatus consensus
-      in which one of their bridges was mentioned. OpenBSD users saw
-      more crashes here, but all platforms were potentially affected.
-      Fixes bug 20103; bugfix on 0.2.8.2-alpha.

changes/bug20203

@@ -1,6 +0,0 @@
-  o Major bugfixes (relay, OOM handler):
-    - Fix a timing-dependent assertion failure that could occur when we
-      tried to flush from a circuit after having freed its cells because
-      of an out-of-memory condition. Fixes bug 20203; bugfix on
-      0.2.8.1-alpha. Thanks to "cypherpunks" for help diagnosing this
-      one.

changes/geoip-september2016

@@ -1,4 +0,0 @@
-  o Minor features (geoip):
-    - Update geoip and geoip6 to the September 6 2016 Maxmind GeoLite2
-      Country database.
-