remove some compiler warn fix #356

Author: jknack

coverage-report/src/test/java/org/jooby/issues/Issue356.java

@@ -1,14 +1,12 @@
 package org.jooby.issues;
 
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertTrue;
+
 import java.time.Duration;
 
 import org.jooby.handlers.AssetHandler;
 import org.jooby.test.ServerFeature;
-
-import static org.junit.Assert.assertNotNull;
-import static org.junit.Assert.assertNull;
-import static org.junit.Assert.assertTrue;
-
 import org.junit.Assert;
 import org.junit.Test;
 

jooby-assets/src/main/java/org/jooby/assets/Assets.java

@@ -19,7 +19,6 @@
 package org.jooby.assets;
 
 import java.time.Duration;
-import java.util.Optional;
 
 import org.jooby.Env;
 import org.jooby.Jooby;