Update readme, fix license

LICENSE

@@ -1,3 +1,6 @@
+NoiseTorch (c) 2020 lawl (github.com/lawl)
+SPDX-License-Identifier: GPL-3.0-or-later
+
                     GNU GENERAL PUBLIC LICENSE
                        Version 3, 29 June 2007
 
@@ -652,7 +655,7 @@ Also add information on how to contact you by electronic and paper mail.
   If the program does terminal interaction, make it output a short
 notice like this when it starts in an interactive mode:
 
-    NoiseTorch  Copyright (C) 2020  lawl (github.com/lawl)
+    <program>  Copyright (C) <year>  <name of author>
     This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
     This is free software, and you are welcome to redistribute it
     under certain conditions; type `show c' for details.

README.md

@@ -1,3 +1,5 @@
+<img src="https://raw.githubusercontent.com/lawl/NoiseTorch/master/assets/icon/noisetorch.png" width="100" height="100">
+
 # NoiseTorch
 
 [![License: GPL v3](https://img.shields.io/badge/License-GPLv3-blue.svg)](https://www.gnu.org/licenses/gpl-3.0)
@@ -79,4 +81,5 @@ In `~/.config/noisetorch/config.toml` set `EnableUpdates = false`.
 
 * [xiph.org](https://xiph.org)/[Mozilla's](https://mozilla.org) excellent [RNNoise](https://jmvalin.ca/demo/rnnoise/).
 * [@werman](https://github.com/werman/)'s [LADSPA/VST wrapper](https://github.com/werman/noise-suppression-for-voice/) allowing us to load RNNoise into PulseAudio.
-* [@aarzilli](https://github.com/aarzilli/)'s [nucular](https://github.com/aarzilli/nucular) GUI toolkit for Go.
+* [@aarzilli](https://github.com/aarzilli/)'s [nucular](https://github.com/aarzilli/nucular) GUI toolkit for Go.
+* [Salee Design](www.salleedesign.com) (info@salleedesign.com)'s Microphone Icon under [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/)