Create changes file

Author: Jessie212

CHANGES.md

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+# History of changes and releases
+
+Release dates, binaries. and other information for the Trino Python client are
+available with the [tags
+list](https://github.com/trinodb/trino-python-client/tags) and the
+[README](https://github.com/trinodb/trino-python-client/blob/master/README.md).
+
+## Trino Python client 0.315.0
+
+* Add support for the `USE catalog.schema` statement.
+* Add support for the `SET ROLE` statement.
+* Make DBAPI errors PEP 249 compatible.