Remove unnecessary type parameter

Author: mwilliamson

src/main/java/org/zwobble/mammoth/internal/conversion/DocumentToHtml.java

@@ -119,7 +119,7 @@ private List<HtmlNode> convertToHtml(List<DocumentElement> elements, Context con
         );
     }
 
-    private <T> List<HtmlNode> convertChildrenToHtml(HasChildren element, Context context) {
+    private List<HtmlNode> convertChildrenToHtml(HasChildren element, Context context) {
         return convertToHtml(element.getChildren(), context);
     }