Remove changes files already merged in 0.2.9.8

changes/bug21018

@@ -1,11 +0,0 @@
-  o Major bugfixes (parsing, security):
-
-    - Fix a bug in parsing that could cause clients to read a single
-      byte past the end of an allocated region. This bug could be
-      used to cause hardened clients (built with
-      --enable-expensive-hardening) to crash if they tried to visit
-      a hostile hidden service.  Non-hardened clients are only
-      affected depending on the details of their platform's memory
-      allocator. Fixes bug 21018; bugfix on 0.2.0.8-alpha. Found by
-      using libFuzzer. Also tracked as TROVE-2016-12-002 and as
-      CVE-2016-1254.

changes/ticket20170-v3

@@ -1,5 +0,0 @@
-  o Minor features (fallback directory list):
-    - Replace the 81 remaining fallbacks of the 100 originally introduced
-      in Tor 0.2.8.3-alpha in March 2016, with a list of 177 fallbacks
-      (123 new, 54 existing, 27 removed) generated in December 2016.
-      Resolves ticket 20170.