Add NEWS entry for issue #19834: merge with 3.3.

diff --cc Misc/NEWS
index 39785a78411e1b0625935d24d2f051da8c8359f0,1af0788bdf9e8c66e04a7fc65ba22996395ff6f5..9b71e13d8bfbb8638c39b6f4b542fc98cd10a9e4
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -18,12 -18,8 +18,14 @@@ Core and Builtin
  Library
  -------
  
+ - Issue #19834: Support unpickling of exceptions pickled by Python 2.
+ 
 +- Issue #19781: ftplib now supports SSLContext.check_hostname and server name
 +  indication for TLS/SSL connections.
 +
 +- Issue #19509: Add SSLContext.check_hostname to match the peer's certificate
 +  with server_hostname on handshake.
 +
  - Issue #15798: Fixed subprocess.Popen() to no longer fail if file
    descriptor 0, 1 or 2 is closed.