Update to v2.0.6

* DESCRIPTION, src/configure.ac: update version, date

* NEWS: add change log for new version

Author: lostbard

DESCRIPTION

@@ -1,6 +1,6 @@
 Name: audio
-Version: 2.0.5
-Date: 2022-07-20
+Version: 2.0.6
+Date: 2023-07-20
 Author: John Donoghue <[email protected]>
 Maintainer: John Donoghue <[email protected]>
 Title: Audio Toolbox

NEWS

@@ -1,5 +1,19 @@
 Summary of important user-visible changes for releases of the audio package
 
+===============================================================================
+audio-2.0.6   Release Date: 2023-07-20
+===============================================================================
+
+  ** minor updates for octave dld classes
+
+  ** NEW FUNCTIONS:
+    - erb2hz and hz2erb
+    - bark2hz and hz2bark
+    - mel2hz and hz2mel
+    - audioOscillator
+
+  ** minor updates to documentation
+
 ===============================================================================
 audio-2.0.5   Release Date: 2022-07-20
 ===============================================================================

src/configure.ac

@@ -1,7 +1,7 @@
 #                                               -*- Autoconf -*-
 # Process this file with autoconf to produce a configure script.
 #
-### Copyright (C) 2019-2022 John Donoghue <[email protected]>
+### Copyright (C) 2019-2023 John Donoghue <[email protected]>
 ###
 ### This program is free software; you can redistribute it and/or
 ### modify it under the terms of the GNU General Public License as
@@ -18,7 +18,7 @@
 ### <http://www.gnu.org/licenses/>.
 
 AC_PREREQ([2.67])
-AC_INIT([octave audio package], [2.0.5])
+AC_INIT([octave audio package], [2.0.6])
 AC_CONFIG_HEADERS([config.h])
 
 # Avoid warnings for redefining AH-generated preprocessor symbols of