Update dataset_infos.json

dataset_infos.json

@@ -62,15 +62,15 @@
          }
       },
       "download_checksums":{
-         "https://github.com/arka0821/multi_document_summarization/master/data/train.json.gz":{
+         "https://github.com/arka0821/multi_document_summarization/main/data/train.json.gz":{
             "num_bytes":46052652,
             "checksum":"447590bb3580b489fe388ccaf563b771ce310d4054b188e4d4055916653ce915"
          },
-         "https://github.com/arka0821/multi_document_summarization/master/data/test.json.gz":{
+         "https://github.com/arka0821/multi_document_summarization/main/data/test.json.gz":{
             "num_bytes":7601038,
             "checksum":"40b08749cc676c28b44e9c328dc3befa659eb2a752344e9388918e47efde3444"
          },
-         "https://github.com/arka0821/multi_document_summarization/master/data/val.json.gz":{
+         "https://github.com/arka0821/multi_document_summarization/main/data/val.json.gz":{
             "num_bytes":7675614,
             "checksum":"fc5a84edad99d9d9fe6e71567b1c198f410e34a3b1e71a56e73b77b930258a8a"
          }