Update copyright for 2019

Happy new year to all the documentation contributors!

community/contributing/code_style_guidelines.rst

@@ -158,8 +158,8 @@ Example:
     /*                           GODOT ENGINE                                */
     /*                      https://godotengine.org                          */
     /*************************************************************************/
-    /* Copyright (c) 2007-2018 Juan Linietsky, Ariel Manzur.                 */
-    /* Copyright (c) 2014-2018 Godot Engine contributors (cf. AUTHORS.md)    */
+    /* Copyright (c) 2007-2019 Juan Linietsky, Ariel Manzur.                 */
+    /* Copyright (c) 2014-2019 Godot Engine contributors (cf. AUTHORS.md)    */
     /*                                                                       */
     /* Permission is hereby granted, free of charge, to any person obtaining */
     /* a copy of this software and associated documentation files (the       */
@@ -203,8 +203,8 @@ Example:
     /*                           GODOT ENGINE                                */
     /*                      https://godotengine.org                          */
     /*************************************************************************/
-    /* Copyright (c) 2007-2018 Juan Linietsky, Ariel Manzur.                 */
-    /* Copyright (c) 2014-2018 Godot Engine contributors (cf. AUTHORS.md)    */
+    /* Copyright (c) 2007-2019 Juan Linietsky, Ariel Manzur.                 */
+    /* Copyright (c) 2014-2019 Godot Engine contributors (cf. AUTHORS.md)    */
     /*                                                                       */
     /* Permission is hereby granted, free of charge, to any person obtaining */
     /* a copy of this software and associated documentation files (the       */

conf.py

@@ -23,7 +23,7 @@ master_doc = 'index'
 
 # General information about the project
 project = 'Godot Engine'
-copyright = '2014-2018, Juan Linietsky, Ariel Manzur and the Godot community (CC-BY 3.0)'
+copyright = '2014-2019, Juan Linietsky, Ariel Manzur and the Godot community (CC-BY 3.0)'
 author = 'Juan Linietsky, Ariel Manzur and the Godot community'
 
 # Version info for the project, acts as replacement for |version| and |release|