Adds the SpongeForge server type

src/test/java/net/knarcraft/minecraftserverlauncher/utility/JarDownloaderTest.java

@@ -41,6 +41,11 @@ public class JarDownloaderTest {
         singleDownloadTest(ServerTypeHandler.getByName("SpongeVanilla"));
     }
 
+    @Test
+    public void spongeForgeDownloadTest() throws IOException, ConfigurationException {
+        singleDownloadTest(ServerTypeHandler.getByName("SpongeForge"));
+    }
+
     @Test
     public void spigotDownloadTest() throws ConfigurationException, IOException {
         singleDownloadTest(ServerTypeHandler.getByName("Spigot"));