Migrate to JUnit5

tolerant-reader/src/test/java/com/iluwatar/tolerantreader/AppTest.java

@@ -22,9 +22,9 @@
  */
 package com.iluwatar.tolerantreader;
 
-import org.junit.After;
-import org.junit.Before;
-import org.junit.Test;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
 
 import java.io.File;
 import java.io.IOException;
@@ -42,8 +42,8 @@ public class AppTest {
     App.main(args);
   }
 
-  @Before
-  @After
+  @BeforeEach
+  @AfterEach
   public void cleanup() {
     File file1 = new File("fish1.out");
     file1.delete();