Rework exporter

@@ -42,0 +50,4 @@
+        exported_text = blocklist_to_markdown(blocklist, private)
+        if output is not None:
+            with open(output, "w") as f:
+                f.write(exported_text)

@@ -54,2 +80,4 @@
     parser.add_argument('-v', '--verbose', action='store_true')
     parser.add_argument('-n', '--no-delete', action='store_true', help="Do not delete existing blocks")
+    parser.add_argument('--format', help="Export format: toml|markdown")
+    parser.add_argument('--private', action='store_true', help="When the flag is set private comment will also be "