Merge branch 'fix/markdown-compile-error'

* fix/markdown-compile-error:
  Markdown: Fix compile errors on JDK 7

Reviewed-by: 김창성 <changsung.kim@navercorp.com>

app/utils/Markdown.java

@@ -153,7 +153,7 @@ private static String renderWithHighlight(String source, boolean breaks) {
      * @param options
      * @return the rendered result or the source if timeout occurs
      */
-    private static String renderByMarked(@Nonnull String source, Object options) throws InterruptedException {
+    private static String renderByMarked(@Nonnull final String source, final Object options) throws InterruptedException {
         if (source.isEmpty()) {
             return source;
         }