Update changelog

Author: jeffgbutler

CHANGELOG.md

@@ -39,6 +39,7 @@ For examples of global and statement configuration, see the "Configuration of th
    the behavior of the library in regard to where clauses that will not render. See the "Configuration of the Library"
    page for details. ([#515](https://github.com/mybatis/mybatis-dynamic-sql/pull/515))
 5. Added several checks for invalid SQL ([#516](https://github.com/mybatis/mybatis-dynamic-sql/pull/516))
+6. Added documentation for the various exceptions thrown by the library ([#517](https://github.com/mybatis/mybatis-dynamic-sql/pull/517))
 
 ## Release 1.4.0 - March 3, 2022