docs: Add changelog

Author: Stranger6667

docs/changelog.rst

@@ -0,0 +1,47 @@
+.. _changelog:
+
+Changelog
+=========
+
+`Unreleased`_
+-------------
+
+Changed
+~~~~~~~
+
+- Nullable custom scalar types are handled gracefully in argument positions.
+  Non-nullable types raise a ``TypeError`` in such cases.
+- Shrink ``Enum`` types to their first value instead of the first value in their sorted list.
+
+
+`0.3.1`_ - 2020-06-04
+---------------------
+
+Added
+~~~~~
+
+- Support for creating ``query`` strategies from ``GraphQLSchema`` instances
+
+`0.3.0`_ - 2020-04-12
+---------------------
+
+Added
+~~~~~
+
+- Query arguments generation
+
+Fixed
+~~~~~
+
+- Selecting fields in queries
+
+0.2.0 - 2020-04-10
+------------------
+
+- Initial public release
+
+.. _Unreleased: https://github.com/stranger6667/hypothesis-graphql/compare/v0.3.1...HEAD
+.. _0.3.1: https://github.com/stranger6667/hypothesis-graphql/compare/v0.3.0...v0.3.1
+.. _0.3.0: https://github.com/stranger6667/hypothesis-graphql/compare/v0.2.0...v0.3.0
+
+.. _#2: https://github.com/stranger6667/hypothesis-graphql/issues/2