fixed build breakage: There is no AssertionError constructor that takes a cause on JDK1.6.

Author: mikesamuel

src/main/java/org/owasp/html/AutoCloseableHtmlStreamRenderer.java

@@ -76,7 +76,9 @@ static void closeIfAnyCloseable(Object closeable) throws IOException {
  try {
  METHOD_CLOSE.invoke(closeable, ZERO_OBJECTS);
  } catch (IllegalAccessException ex) {
- throw new AssertionError("close not public", ex);
+ AssertionError ae = new AssertionError("close not public");
+ ae.initCause(ex);
+ throw ae;
  } catch (InvocationTargetException ex) {
  Throwable tgt = ex.getTargetException();
  if (tgt instanceof IOException) {