fix: #61 markdown multi empty line

Author: shaunthegeek

app/Confluence.php

@@ -67,7 +67,9 @@ public function htmlFile2Markdown(string $filename): string
             $element->parentNode->removeChild($element);
         }
         $html = $this->document->saveHTML($contentElement);
-        return $this->htmlConverter->convert($html);
+        $markdown = $this->htmlConverter->convert($html);
+        $markdown = preg_replace("/[ ]*\n/s", "\n", $markdown);
+        return preg_replace("/\n\n\n/s", "\n", $markdown);
     }
 
     /**

tests/data/confluence/recent-space-activity-demo.md

@@ -1,8 +1,4 @@
 hello
 =====
 
- 
-
- 
-
 Hello World!

tests/data/confluence/space-contributors-demo.md

@@ -1,6 +1,4 @@
 hello
 =====
 
- 
-
 Hello World!