Close opened resources

- Add BufferedReader instantiation into try-with-resources statement
- Close scanner that was opened
- Create utility class to format a caught exception

src/test/java/fr/xephi/authme/util/StringUtilsTest.java

@@ -2,6 +2,7 @@ package fr.xephi.authme.util;
 
 import org.junit.Test;
 
+import java.net.MalformedURLException;
 import java.util.Arrays;
 import java.util.List;
 
@@ -84,4 +85,16 @@ public class StringUtilsTest {
         // then
         assertThat(result, equalTo("hello"));
     }
+
+    @Test
+    public void shouldFormatException() {
+        // given
+        MalformedURLException ex = new MalformedURLException("Unrecognized URL format");
+
+        // when
+        String result = StringUtils.formatException(ex);
+
+        // then
+        assertThat(result, equalTo("[MalformedURLException]: Unrecognized URL format"));
+    }
 }