Add PQ (pullquote) type

This appears for something like medium's "top highlight". It's like a
blockquote but bigger

spec/classes/paragraph_converter_spec.cr

@@ -244,6 +244,15 @@ describe ParagraphConverter do
           "layout": null,
           "metadata": null
         },
+        {
+          "text": "text",
+          "type": "PQ",
+          "markups": [],
+          "href": null,
+          "iframe": null,
+          "layout": null,
+          "metadata": null
+        },
         {
           "text": "text",
           "type": "ULI",
@@ -295,7 +304,8 @@ describe ParagraphConverter do
       Heading4.new([Text.new("text")] of Child),
       Paragraph.new([Text.new("text")] of Child),
       Preformatted.new([Text.new("text")] of Child),
-      BlockQuote.new([Text.new("text")] of Child),
+      BlockQuote.new([Text.new("text")] of Child), # BQ
+      BlockQuote.new([Text.new("text")] of Child), # PQ
       UnorderedList.new([ListItem.new([Text.new("text")] of Child)] of Child),
       OrderedList.new([ListItem.new([Text.new("text")] of Child)] of Child),
       Figure.new(children: [

src/classes/paragraph_converter.cr

@@ -35,6 +35,10 @@ class ParagraphConverter
         paragraph = paragraphs.shift
         children = MarkupConverter.convert(paragraph.text, paragraph.markups)
         node = Paragraph.new(children: children)
+      when PostResponse::ParagraphType::PQ
+        paragraph = paragraphs.shift
+        children = MarkupConverter.convert(paragraph.text, paragraph.markups)
+        node = BlockQuote.new(children: children)
       when PostResponse::ParagraphType::PRE
         paragraph = paragraphs.shift
         children = MarkupConverter.convert(paragraph.text, paragraph.markups)

src/models/post_response.cr

@@ -47,6 +47,7 @@ class PostResponse
     IMG
     OLI
     P
+    PQ
     PRE
     ULI
   end