v3.1.0b0
Pre-release
      Pre-release
    
        First beta release of GraphQL-core 3.1, based on GraphQL.js v15.0.0rc1.
In addition to incorporating the latest changes from GraphQL.js (see the list of changes in GraphQL.js v15.0.0a1, v15.0.0a2 and v15.0.0rc1), this release also contains the following improvements and changes:
- Change: Use 
Undefinedinstead ofINVALIDwhich is now deprecated (#77) - Use explicit 
Optionaltype on arguments (#76) - Remove unnecessary result type annotation from 
__init__methods (python/mypy#5677) - Better docstring for 
ast_from_value - Better docstring for 
lexicographic_sort_schema(#75) - Fixed a minor issue when coverting lists in 
ast_from_value() - Fixed a minor issue with 
MapAsyncIterator.athrow() - Improved test coverage (trying to reach 100% for final release)
 
Contributors to this release were:
Thanks to everybody who contributed by sending bug reports or pull requests. Please continue to report any problems you find in this beta release, so that these can be fixed in the final v3.1 release.