Bump to opengl 450

shader/fullscreen/alphaHalve.frag

@@ -1,3 +1,3 @@
-#version 430 core
+#version 450 core
 out vec4 fColor;
 void main () { fColor = vec4(0,0,0,0.5);}

shader/fullscreen/alphaHalve.vert

@@ -1,4 +1,4 @@
-#version 430 core
+#version 450 core
 layout (location = 0) in vec2 position;
 void main()
 { gl_Position = vec4 (position, 0 , 1);}