Update to GNU make release candidate 4.2.91
diff --git a/NEWS b/NEWS
index ccfda3e..dd86d9c 100644
--- a/NEWS
+++ b/NEWS
@@ -1,6 +1,6 @@
 GNU make NEWS                                               -*-indented-text-*-
   History of user-visible changes.
-  26 August 2019
+  3 September 2019
 
 See the end of this file for copyrights and conditions.
 
@@ -9,7 +9,7 @@
 See the README file and the GNU make manual for instructions for
 reporting bugs.
 
-Version 4.2.90 (26 Aug 2019)
+Version 4.2.91 (3 Sep 2019)
 
 A complete list of bugs fixed in this version is available here:
 
diff --git a/configure.ac b/configure.ac
index 6b84010..da1e17d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -16,7 +16,7 @@
 # You should have received a copy of the GNU General Public License along with
 # this program.  If not, see <http://www.gnu.org/licenses/>.
 
-AC_INIT([GNU make],[4.2.90],[bug-make@gnu.org])
+AC_INIT([GNU make],[4.2.91],[bug-make@gnu.org])
 
 AC_PREREQ([2.69])