Improve ScreenUtils

Author: JessYanCoding

autosize/src/main/java/me/jessyan/autosize/utils/ScreenUtils.java

@@ -32,6 +32,10 @@
  */
 public class ScreenUtils {
 
+    private ScreenUtils() {
+        throw new IllegalStateException("you can't instantiate me!");
+    }
+
     public static int getStatusBarHeight() {
         int result = 0;
         try {