Fix shader versions

examples/resources/shaders/shapes_base.vs

@@ -1,4 +1,4 @@
-#version 110
+#version 330
 
 attribute vec3 vertexPosition;
 attribute vec2 vertexTexCoord;

examples/resources/shaders/shapes_grayscale.fs

@@ -1,4 +1,4 @@
-#version 110
+#version 330
 
 uniform sampler2D texture0;
 varying vec2 fragTexCoord;