[newlib-cygwin/cygwin-3_0-branch] Cygwin: add latest signal handling fixes to release notes

[Corinna Vinschen]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=51dc93a98bb91905dc2f54e82a3514a77eabb1c3

commit 51dc93a98bb91905dc2f54e82a3514a77eabb1c3
Author: Corinna Vinschen <corinna@vinschen.de>
Date:   Sat Apr 6 18:03:22 2019 +0200

    Cygwin: add latest signal handling fixes to release notes
    
    Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

Diff:
---
 winsup/cygwin/release/3.0.6 | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/winsup/cygwin/release/3.0.6 b/winsup/cygwin/release/3.0.6
index 14a8329..d9fca58 100644
--- a/winsup/cygwin/release/3.0.6
+++ b/winsup/cygwin/release/3.0.6
@@ -9,6 +9,11 @@ What changed:
 Bug Fixes
 ---------
 
-- Fix the problem that `ps' or `pstree' may show up in their own
-  output twice.
+- Fix the problem that `ps' or `pstree' may show up in their own output twice.
   Addresses: Report on IRC
+
+- Honor setting uc_sigmask in a sigaction signal handler.
+  Addresses: https://cygwin.com/ml/cygwin/2019-04/msg00016.html
+
+- Fix signal handling if setcontext is called from a signal handler.
+  Addresses: Self-tested.