remove changes files for items that appeared in 0.3.17

changes/bug23533

@@ -1,4 +0,0 @@
-  o Minor bugfixes (relay):
-    - Inform the geoip and rephist modules about all requests, even
-      on relays that are only fetching microdescriptors. Fixes a bug related
-      to 21585; bugfix on 0.3.0.1-alpha.

changes/trove-2017-008

@@ -1,5 +0,0 @@
-  o Major bugfixes (security, hidden services, loggging):
-    - Fix a bug where we could log uninitialized stack when a certain
-      hidden service error occurred while SafeLogging was disabled.
-      Fixes bug #23490; bugfix on 0.2.7.2-alpha.
-      This is also tracked as TROVE-2017-008 and CVE-2017-0380.