Update NEWS for release

NEWS

@@ -1,3 +1,31 @@
+Changes in 1.12.0
+~~~~~~~~~~~~~~~~~
+Released: 2021-10-08
+
+This is the first stable release in the 1.12.x series. The major changes
+in this series is the support for better control of sub-sandboxes, as
+used by the steam flatpak.
+
+In addition, this release fixes a security vulnerability in the portal
+support. Some recently added syscalls were not blocked by the seccomp rules
+which allowed the application to create sub-sandboxes which can confuste
+the sandboxing verification mechanisms of the portal. This has been
+fixed by extending the seccomp rules.
+For details, see:
+  https://github.com/flatpak/flatpak/security/advisories/GHSA-67h7-w3jq-vh4q
+
+Other changes in this version:
+ * Some test fixes
+ * Update translations
+ * Support for specifying the flatpak binary to use during exports
+ * Install translations for all languages in the locale, not just the ones in
+   LC_MESSAGES.
+ * Fix progress reporting in flatpak fsck
+ * Handle cases where /var/tmp is a symlink
+ * Expose /etc/gai.conf to the sandbox
+ * Fix the parental control checks for root
+ * Handle missing /etc/ld.so.cache (musl)
+
 Changes in 1.11.3
 ~~~~~~~~~~~~~~~~~
 Released: 2021-08-25