Normalize CRLF to LF in jekyll-tag included file content

Author: travkin79

flexmark-ext-jekyll-tag/src/main/java/com/vladsch/flexmark/ext/jekyll/tag/internal/IncludeNodePostProcessor.java

@@ -103,7 +103,7 @@ public void process(@NotNull NodeTracker state, @NotNull Node node) {
                         }
 
                         if (resolvedContent.getStatus() == LinkStatus.VALID) {
-                            fileContent = new String(resolvedContent.getContent(), StandardCharsets.UTF_8);
+                            fileContent = new String(resolvedContent.getContent(), StandardCharsets.UTF_8).replace("\r\n", "\n");
                         }
                     }
                 }