remove changes files that appear in 0.3.2.8-rc

  o Major bugfixes (KIST, scheduler):

    - The KIST scheduler did not correctly account for data already enqueued

      in each connection's send socket buffer, particularly in cases when the

      TCP/IP congestion window was reduced between scheduler calls. This

      situation lead to excessive per-connection buffering in the kernel, and

      a potential memory DoS. Fixes bug 24665; bugfix on 0.3.2.1-alpha.

  o Minor bugfixes (memory usage):

    - When queuing DESTROY cells on a channel, only queue the

      circuit-id and reason fields: not the entire 514-byte

      cell. This fix should help mitigate any bugs or attacks that

      fill up these queues, and free more RAM for other uses. Fixes

      bug 24666; bugfix on 0.2.5.1-alpha.

  o Minor bugfixes (scheduler, KIST):

    - Use a sane write limit for KISTLite when writing onto a connection

      buffer instead of using INT_MAX and shoving as much as it can. Because

      the OOM handler cleans up circuit queues, we are better off at keeping

      them in that queue instead of the connection's buffer. Fixes bug 24671;

      bugfix on 0.3.2.1-alpha.

  o Minor features (geoip):

    - Update geoip and geoip6 to the December 6 2017 Maxmind GeoLite2

      Country database.

  o Minor bugfixes (hidden service v3):

    - Bump hsdir_spread_store parameter from 3 to 4 in order to increase the

      probability of reaching a service for a client missing microdescriptors.

      Fixes bug 24425; bugfix on 0.3.2.1-alpha.