Add missing type arguments

Author: mwilliamson

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

@@ -135,7 +135,7 @@ private List<HtmlNode> convertToHtml(List<DocumentElement> elements, Context con
         );
     }
 
-    private List<HtmlNode> convertChildrenToHtml(HasChildren element, Context context) {
+    private <T> List<HtmlNode> convertChildrenToHtml(HasChildren<T> element, Context context) {
         return convertToHtml(element.getChildren(), context);
     }
 

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

@@ -13,7 +13,7 @@ public static String extractRawText(Document document) {
         return extractRawTextOfChildren(document);
     }
 
-    private static String extractRawTextOfChildren(HasChildren parent) {
+    private static <T> String extractRawTextOfChildren(HasChildren<T> parent) {
         return extractRawText(parent.getChildren());
     }