Update CHANGES and configure.ac (#169)

diff --git a/CHANGES b/CHANGES
index aeba46f..534c902 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,7 @@
+duo_unix-1.11.3:
+- Added support for RedHat 8, CentOS 8, and Debian 10
+- Improved validation of BSON messages
+
 duo_unix-1.11.2:
 - Added recommended Kerberos configuration for Duo Unix to our documentation, found at https://help.duo.com/s/article/5085. Thanks to Neal Poole at Facebook for bringing expertise and attention to this topic.
 - Updated SELinux policy to allow local logins to use the pam_duo PAM module and made sshd configurable
diff --git a/configure.ac b/configure.ac
index ecfc8c1..90a9b87 100644
--- a/configure.ac
+++ b/configure.ac
@@ -7,7 +7,7 @@
 
 # Package, version, bug report address
 AC_INIT([duo_unix],
-	[1.11.2],
+	[1.11.3],
 	[support@duosecurity.com])
 
 # Tells autoconf where to find necessary build scripts and macros.