Fixes some warnings

src/test/java/net/knarcraft/bookswithoutborders/encryption/AESTest.java

@@ -1,9 +1,9 @@
 package net.knarcraft.bookswithoutborders.encryption;
 
-import junit.framework.Assert;
 import org.junit.Test;
 
-import static junit.framework.Assert.assertEquals;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotSame;
 
 public class AESTest {
 
@@ -15,7 +15,7 @@ public class AESTest {
         AES aes = new AES(AES.generateIV(), AES.generateIV());
 
         String encrypted = aes.encryptDecryptText(plainText, password, true);
-        Assert.assertNotSame(encrypted, plainText);
+        assertNotSame(encrypted, plainText);
         String decrypted = aes.encryptDecryptText(encrypted, password, false);
         assertEquals(plainText, decrypted);
     }