Remove a file which causes cloning on Windows platform to fail

There is a known issue with git-for-windows and currently clone and
pull fail with invalid path errors if the target repository has any
filename containing a character prohibited in Windows. We can find
below examples reporting that issue.
 git-for-windows/git#2777
 git-for-windows/git#2803
 git-for-windows/git#2849

Because it is unlikely that the issue is solved in git-for-windows
shortly, this change drops one release note file currently causing
the failure, as a quick workaround. Note that we can't rename existing
release note files because that would make notes appear in a wrong
release, and this is why this change should remove that file.

Change-Id: Ib3615761b366ed849177ae79d7d105ef8b839da4