fix: make linkTransformer a promise

Author: jsakas

src/notion-to-md.ts

@@ -385,7 +385,7 @@ export class NotionToMarkdown {
               title = matches ? matches[0] : type;
             }
 
-            return this.linkTransformer(title, link);
+            return await this.linkTransformer(title, link);
           }
         }
         break;
@@ -410,7 +410,7 @@ export class NotionToMarkdown {
           }
 
           if (blockContent)
-            return this.linkTransformer(title, blockContent.url);
+            return await this.linkTransformer(title, blockContent.url);
         }
         break;
 
@@ -501,7 +501,10 @@ export class NotionToMarkdown {
           plain_text = this.annotatePlainText(plain_text, annotations);
 
           if (content["href"])
-            plain_text = this.linkTransformer(plain_text, content["href"]);
+            plain_text = await this.linkTransformer(
+              plain_text,
+              content["href"],
+            );
 
           parsedData += plain_text;
         });