Add Logo license and author credit

Author: touilleMan

AUTHORS.rst

@@ -7,6 +7,11 @@ Development Lead
 
 * Emmanuel Leblond `@touilleMan <https://github.com/touilleMan>`_
 
+Godot Python logo
+-----------------
+
+* `@Pinswell <https://github.com/Pinswell>`_
+
 Contributors
 ------------
 

LICENSE

@@ -1,4 +1,4 @@
-Copyright (c) 2016 by Emmanuel Leblond.
+Godot Python Copyright (c) 2016 by Emmanuel Leblond.
 MIT License
 
 Permission is hereby granted, free of charge, to any person obtaining a
@@ -18,3 +18,8 @@ AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 DEALINGS IN THE SOFTWARE.
+
+Godot Python Logo (C) Pinswell
+Distributed under the terms of the Creative Commons Attribution License
+version 3.0 (CC-BY 3.0)
+https://creativecommons.org/licenses/by/3.0/legalcode.