[newlib-cygwin] Cygwin: document the last bugfix

[Ken Brown]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=69772c43327727c49b7691717a7886fa1088d5bf

commit 69772c43327727c49b7691717a7886fa1088d5bf
Author: Ken Brown <kbrown@cornell.edu>
Date:   Tue Dec 10 08:45:17 2019 -0500

    Cygwin: document the last bugfix

Diff:
---
 winsup/cygwin/release/3.1.0 | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/winsup/cygwin/release/3.1.0 b/winsup/cygwin/release/3.1.0
index 345dd62..b0e8456 100644
--- a/winsup/cygwin/release/3.1.0
+++ b/winsup/cygwin/release/3.1.0
@@ -104,3 +104,7 @@ Bug Fixes
 - Fix a security problem if Cygwin is installed into a path
   with spaces in it.
   Addresses: https://cygwin.com/ml/cygwin/2019-11/msg00018.html
+
+- Fix an assertion failure when /cygdrive contains an offline network
+  drive.
+  Addresses: https://cygwin.com/ml/cygwin/2019-12/msg00016.html