message: Add missing copyright statement in shader
diff: +/******************************************************************************
  + * The MIT License (MIT)
  + *
  + * Copyright (c) 2020 Baldur Karlsson
  + *
  + * Permission is hereby granted, free of charge, to any person obtaining a copy
  + * of this software and associated documentation files (the "Software"), to deal
  + * in the Software without restriction, including without limitation the rights
  + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  + * copies of the Software, and to permit persons to whom the Software is
  + * furnished to do so, subject to the following conditions:
  + *
  + * The above copyright notice and this permission notice shall be included in
  + * all copies or substantial portions of the Software.
  + *
  + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  + * 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.
  + ******************************************************************************/
  +
  #include "glsl_globals.h"
  IO_LOCATION(0) out vec4 color_out;
  