Add UPDATING entries and bump version.

Approved by:	so

UPDATING

@@ -16,6 +16,25 @@ from older versions of FreeBSD, try WITHOUT_CLANG and WITH_GCC to bootstrap to
 the tip of head, and then rebuild without this option. The bootstrap process
 from older version of current across the gcc/clang cutover is a bit fragile.
 
+20201201:	p11	FreeBSD-EN-20:19.audit
+			FreeBSD-EN-20:20.tzdata
+			FreeBSD-EN-20:21.ipfw
+			FreeBSD-EN-20:22.callout
+			FreeBSD-SA-20:31.icmp6
+			FreeBSD-SA-20:32.rtsold
+
+        Fix execve/fexecve system call auditing. [EN-20:19.audit]
+
+        Update timezone database information. [EN-20:20.tzdata]
+
+        Fix uninitialized variable in ipfw. [EN-20:21.ipfw]
+
+        Fix race condition in callout CPU migration. [EN-20:22.callout]
+
+        Fix ICMPv6 use-after-free in error message handling. [SA-20:31.icmp6]
+
+        Fix multiple vulnerabilities in rtsold. [SA-20:32.rtsold]
+
 20200915	p10	FreeBSD-SA-20:27.ure
 			FreeBSD-SA-20:28.bhyve_vmcs
 			FreeBSD-SA-20:29.bhyve_svm

sys/conf/newvers.sh

@@ -46,7 +46,7 @@
 
 TYPE="FreeBSD"
 REVISION="12.1"
-BRANCH="RELEASE-p10"
+BRANCH="RELEASE-p11"
 if [ -n "${BRANCH_OVERRIDE}" ]; then
 	BRANCH=${BRANCH_OVERRIDE}
 fi