Add support for literal string blocks.

src/renderer/inline_partial_tree.rs

@@ -63,6 +63,7 @@ fn extract_inline_partials_from_tag<'a, 'b>(
     match tag {
         DustTag::DTComment(..) => (),
         DustTag::DTSpecial(..) => (),
+        DustTag::DTLiteralStringBlock(..) => (),
         DustTag::DTReference(..) => (),
         DustTag::DTSection(container) => {
             match &container.contents {

src/renderer/renderer.rs

@@ -144,6 +144,7 @@ impl<'a> DustRenderer<'a> {
                 }
                 .to_owned())
             }
+            DustTag::DTLiteralStringBlock(literal) => return Ok((*literal).to_owned()),
             DustTag::DTReference(reference) => {
                 let val = walk_path(breadcrumbs, &reference.path.keys);
                 match val {