Release 2.1.5.

Author: bgrainger

docs/content/overview/version-history.md

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-lastmod: 2022-01-25
+lastmod: 2022-01-30
 date: 2017-03-27
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 # Version History
 
+### 2.1.5
+
+* Speed up `MySqlDataAdapter.Update` when `UpdateBatchSize` is large: [#1124](https://github.com/mysql-net/MySqlConnector/issues/1124).
+* Remove `DO SLEEP(0)` use after cancelling a query: [#1115](https://github.com/mysql-net/MySqlConnector/issues/1115).
+  * This improves compatibility with MariaDB Xpand.
+* Encode NUL bytes as `\0` on the write: [#1121](https://github.com/mysql-net/MySqlConnector/issues/1121).
+  * This improves compatibility with SingleStore.
+
 ### 2.1.4
 
 * Fix `InvalidOperationException` if `MySqlDataReader.RecordsAffected` was read after calling `Close()` or `Dispose()`: [#1122](https://github.com/mysql-net/MySqlConnector/issues/1122).