maint: Bump shared library version.  Prepare NEWS file for release.

Signed-off-by: Simon Josefsson <simon@josefsson.org>

NEWS

diff --git a/NEWS b/NEWS
index f2ab665..d07f6db 100644
--- a/NEWS
+++ b/NEWS
@@ -3,6 +3,7 @@
 * Noteworthy changes in release ?.? (????-??-??) [?]
 - Improve GTK-DOC manual.  Closes: #35.
 - Improve --help and --version for tools with gnulib.  Closes: #37.
+- Update gnulib files and various maintenance fixes.
 
 * Noteworthy changes in release 4.17.0 (2021-05-13) [stable]
 - Print deprecation messages for deprecated macros, thanks to Tim Rühsen.

configure.ac

diff --git a/configure.ac b/configure.ac
index 4df249c..874e5fe 100644
--- a/configure.ac
+++ b/configure.ac
@@ -25,7 +25,7 @@
 # Interfaces added:                             AGE++
 # Interfaces removed:                           AGE=0
 AC_SUBST(LT_CURRENT, 12)
-AC_SUBST(LT_REVISION, 1)
+AC_SUBST(LT_REVISION, 2)
 AC_SUBST(LT_AGE, 6)
 
 AC_SUBST([MAJOR_VERSION], [`echo $PACKAGE_VERSION|cut -d'.' -f1`])