Update changelog

Author: rhpvorderman

CHANGELOG.rst

@@ -10,9 +10,16 @@ Changelog
 version 0.11.0-dev
 ------------------
 In this release the ``python -m isal.igzip`` relatively slow decompression rate
-has been improved. Previously it was 19% slower than ``igzip`` when used with
-the ``-d`` flag for decompressing, now it is just 8% slower.
-
+has been improved in both speed and usability. Previously it was 19% slower
+than ``igzip`` when used with the ``-d`` flag for decompressing, now it is
+just 8% slower. Also some extra flags were added to make it easier to select
+the output file.
+
++ Prompt when an output file is overwritten with the ``python -m isal.igzip``
+  command line utility and provide the ``-f`` or ``--force`` flags to force
+  overwriting.
++ Added ``-o`` and ``--output`` flags to the ``python -m isal.igzip`` command
+  line utility to allow the user to select the destination of the output file.
 + Reverse a bug in the build system which caused some docstring and parameter
   information on ``igzip_lib`` and ``isal_zlib`` to disappear in the
   documentation and the REPL.