Add licenses

README.md

@@ -103,7 +103,7 @@ The data fields are the same among all splits:
 - `subject`: subject of the commit (this is used for all experiments in the paper)
 - `message`: message of the commit (commonly the same as the subject)
 - `lang`: programming language
-- `license`: license of the repository the code stems from
+- `license`: license of the repository the code stems from, one of `['mit', 'artistic-2.0', 'isc', 'cc0-1.0', 'epl-1.0', 'mpl-2.0', 'unlicense', 'unknown', 'apache-2.0', 'bsd-3-clause', 'agpl-3.0', 'lgpl-2.1', 'bsd-2-clause']`
 - `repos`: name of the the repository the code stems from (if multiple, they are comma separated)
 
 ### Data Splits