Update README.md

Author: myd7349

README.md

@@ -185,6 +185,7 @@ A curated list of awesome C/C++ frameworks, libraries, resources, and shiny thin
 ## GUI
 *Graphic User Interface*
 
+* [FLTK](http://www.fltk.org/index.php) - Fast, light, cross-platform C++ GUI toolkit. [GPLv2]
 * [GTK+](http://www.gtk.org/) - A multi-platform toolkit for creating graphical user interfaces. [LGPL]
 * [gtkmm](http://www.gtkmm.org/en/) - The official C++ interface for the popular GUI library GTK+. [LGPL]
 * [imgui](https://github.com/ocornut/imgui) - Immediate Mode Graphical User Interface with minimal dependencies. [MIT]
@@ -194,7 +195,6 @@ A curated list of awesome C/C++ frameworks, libraries, resources, and shiny thin
 * [QwtPlot3D](http://qwtplot3d.sourceforge.net/) - A feature-rich Qt/OpenGL-based C++ programming library, providing essentially a bunch of 3D-widgets. [zlib]
 * [OtterUI](https://github.com/Twolewis/OtterUI) - OtterUI is a User Interface development solution for embedded systems and interactive entertainment software. [MIT]
 * [wxWidgets](http://wxwidgets.org/) - A C++ library that lets developers create applications for Windows, Mac OS X, Linux and other platforms with a single code base. [Own LGPL]
-* [FLTK](http://www.fltk.org/index.php) - Fast, light, cross-platform C++ GUI toolkit. [GPLv2]
 
 ## Graphics