Fix license information (#7)

- Fix license information (9a9f7f2341a1cbacf2d52b8728313d63876b010d)

README.md

@@ -23,7 +23,7 @@ language:
 - vi
 - zh
 license:
-- cc-by-3.0
+- cc-by-nc-sa-3.0
 multilinguality:
 - multilingual
 size_categories:
@@ -166,7 +166,7 @@ No information about the user demographic is available.
 <!-- quick -->
 <!-- info: What is the license of the dataset? -->
 <!-- scope: telescope -->
-cc-by-3.0: Creative Commons Attribution 3.0 Unported
+cc-by-nc-sa-3.0: Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported (CC BY-NC-SA 3.0)
 
 #### Intended Use