use tabs instead of spaces

src/main/java/com/mykola2312/retracker/App.java

@@ -4,7 +4,7 @@ package com.mykola2312.retracker;
  * Hello world!
  */
 public class App {
-    public static void main(String[] args) {
-        System.out.println("Hello World!");
-    }
+	public static void main(String[] args) {
+    	System.out.println("Hello World!");
+	}
 }

src/test/java/com/mykola2312/retracker/AppTest.java

@@ -9,11 +9,11 @@ import org.junit.jupiter.api.Test;
  */
 public class AppTest {
 
-    /**
-     * Rigorous Test :-)
-     */
-    @Test
-    public void shouldAnswerWithTrue() {
-        assertTrue(true);
-    }
+	/**
+	 * Rigorous Test :-)
+	 */
+	@Test
+	public void shouldAnswerWithTrue() {
+		assertTrue(true);
+	}
 }