Fix `license` metadata

We recently updated the datasets metadata for consistency with other repo types (models & spaces)

Thanks! 🙏

README.md

@@ -1,7 +1,7 @@
 ---
-languages:
+language:
 - en
-licenses:
+license:
 - mit
 ---
 This question base consits of 5000 travel domain based questions which are being annotated under a taxonomy related to the travel domain. The taxonomy is a hierarchical taxonomy with two levels of 7 coarse classes and 63 fine classes. 5000TravelQuestionsDataset.xlsx file consists of the annotated question base and the taxonomy. For the question base only use 5000TravelQuestionsDataset.csv file.