Version bumps, release notes for iperf 3.1.1.

RELEASE_NOTES

@@ -1,3 +1,24 @@
+== iperf 3.1.1 2015-11-?? ==
+
+The release notes for iperf 3.1.1 describe changes and new
+functionality in iperf 3.1.1, but not present in 3.1.
+
+* User-visible changes
+
+  * Some markup fixes have been made in the manpages for Debian
+    compatibility (issue #291).
+
+  * A bug where the -T title option was not being output correctly
+    in JSON output has been fixed (issue #292).
+
+  * Argument handling for some command-line options has been improved
+    (issue #316).
+
+* Developer-visible changes
+
+  * A regression with C++ compatibility in one of the iperf header
+    files has been fixed (issue #323).
+
 == iperf 3.1 2015-10-16 ==
 
 The release notes for iperf 3.1 describe changes and new

configure.ac

@@ -24,7 +24,7 @@
 # file for complete information.
 
 # Initialize the autoconf system for the specified tool, version and mailing list
-AC_INIT(iperf, 3.1, https://github.com/esnet/iperf, iperf, http://software.es.net/iperf/)
+AC_INIT(iperf, 3.1.1, https://github.com/esnet/iperf, iperf, http://software.es.net/iperf/)
 AC_LANG(C)
 
 # Specify where the auxiliary files created by configure should go. The config