Fix an undeclared dependency on JUnit 5.

src/test/java/com/southernstorm/noise/tests/UnitVectorTests.java

@@ -3,14 +3,14 @@ package com.southernstorm.noise.tests;
 import java.io.InputStream;
 import java.net.URL;
 import org.junit.Assert;
-import org.junit.jupiter.api.Test;
+import org.junit.Test;
 
 public class UnitVectorTests {
 
   private static final String testVectorsCommit = "5d0a74760320e5486ced302e36ccad91606aac43";
 
   @Test
-  void testBasicVector() throws Exception {
+  public void testBasicVector() throws Exception {
     try (InputStream stream = new URL(
         "https://raw.githubusercontent.com/rweather/noise-c/" + testVectorsCommit
             + "/tests/vector/noise-c-basic.txt").openStream()) {