Set `sep=" "` for the duplicates file

README.md

@@ -6,6 +6,7 @@ configs:
   data_files: "charsets.csv"
 - config_name: Duplicates
   data_files: "crawlduplicates.txt"
+  sep: " "
 - config_name: Crawlmetrics
   data_files: "crawlmetrics.csv"
 - config_name: Crawl metrics by type