Merge #18805 NEWS fix from 3.3

diff --cc Misc/NEWS
index 92d668ca99a6e6774fae125156908f249ea11f95,f3f94bfb836ab42869815ed6d24ef4fcf255c037..10ebee27b37e8ce735c7d17e20eb201f56e96866
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -28,17 -49,8 +28,17 @@@ Librar
  -------
  
  - Issue #18805: the netmask/hostmask parsing in ipaddress now more reliably
-   filters out illegal values
+   filters out illegal values and correctly allows any valid prefix length.
  
 +- Issue #20481: For at least Python 3.4, the statistics module will require
 +  that all inputs for a single operation be of a single consistent type, or
 +  else a mixed of ints and a single other consistent type. This avoids
 +  some interoperability issues that arose with the previous approach of
 +  coercing to a suitable common type.
 +
 +- Issue #20478: the statistics module now treats collections.Counter inputs
 +  like any other iterable.
 +
  - Issue #17369: get_filename was raising an exception if the filename
    parameter's RFC2231 encoding was broken in certain ways.  This was
    a regression relative to python2.