Use try-with-resources for EncodingTester

This change wraps the `new HtmlInputStreamReader` call in a
try-with-resources construct, to ensure the HtmlInputStreamReader
instance gets automatically closed.

Without this change, Eclipse and other IDEs complain about the
HtmlInputStreamReader instance never getting closed.

Author: sideshowbarker

test-src/nu/validator/htmlparser/test/EncodingTester.java

@@ -69,8 +69,8 @@ private boolean runTest() throws IOException, SAXException {
             return false;
         }
         UntilHashInputStream stream = new UntilHashInputStream(aggregateStream);
-        HtmlInputStreamReader reader = new HtmlInputStreamReader(stream, null,
-                null, null, Heuristics.NONE, sniffingLimit);
+        try (HtmlInputStreamReader reader = new HtmlInputStreamReader(stream, null,
+                null, null, Heuristics.NONE, sniffingLimit)) {
         Charset charset = reader.getCharset();
         stream.close();
         if (skipLabel()) {
@@ -101,6 +101,7 @@ private boolean runTest() throws IOException, SAXException {
             System.err.println(stream);
         }
         return true;
+        }
     }
 
     private boolean skipLabel() throws IOException {