[libgdx] Removed unused import.

spine-libgdx/spine-libgdx-tests/src/com/esotericsoftware/spine/VertexEffectTest.java

@@ -39,7 +39,6 @@ import com.badlogic.gdx.graphics.OrthographicCamera;
 import com.badlogic.gdx.graphics.g2d.PolygonSpriteBatch;
 import com.badlogic.gdx.graphics.g2d.TextureAtlas;
 import com.badlogic.gdx.math.Interpolation;
-import com.esotericsoftware.spine.vertexeffects.JitterEffect;
 import com.esotericsoftware.spine.vertexeffects.SwirlEffect;
 
 public class VertexEffectTest extends ApplicationAdapter {