set default git-issues-blog footer

Sep0lkit · Sep0lkit · commit 9d27040b8159 · 2019-09-14T21:29:33.000+08:00
diff --git a/git-issues-blog.py b/git-issues-blog.py
@@ -72,7 +72,7 @@
 if footer.exists():
     issue_footer = footer.read_text()
 else:
-    issue_footer = ""
+    issue_footer = "------\nPowered by [Git-Issues-Blog](https://github.com/marketplace/actions/git-issues-blog)"
 
 
 for p in POSTS:
