Pyathenajdbc

* Drop support for Python2.7 and Python3.5.
* Suport for Python3.8 and Python3.9.
* Add type hints.
* Update JDBC driver to 2.0.15.
The download URL for the JDBC driver has changed since 2.0.15.
2.0.14: https://s3.amazonaws.com/athena-downloads/drivers/JDBC/SimbaAthenaJDBC_2.0.14/AthenaJDBC42_2.0.14.jar
2.0.15: https://s3.amazonaws.com/athena-downloads/drivers/JDBC/SimbaAthenaJDBC-2.0.15.1000/AthenaJDBC42.jar
* Redesign Formatter and Converter classes.
Add JDBCTypeConverter abstract class and Formatter abstract class.
Change the name of JDBCTypeConverter to DefaultJDBCTypeConverter.
Change the name of ParameterFormatter to DefaultParameterFormatter.

* Update JDBC driver to 2.0.14

**This release contains compatibility-breaking changes.**
* Change the connect method and Connection object arguments to have the same name as the JDBC driver's Driver Configuration Options.

| Old argument names | New argument names |
| --- | --- |
| access_key | User |
| secret_key | Password |
| region_name | AwsRegion |
| schema_name | Schema |
| s3_staging_dir | S3OuputLocation |

* Changed the default authentication delegate to use DefaultAWSCredentialsProviderChain.
* Remove botocore dependencies.
* Update JDBC driver to 2.0.13.

Porting the following features from PyAthena.
* Impl AthenaTypeCompiler
https://github.com/laughingman7743/PyAthena/pull/147

Porting the following features from PyAthena.
* Change s3_staging_dir argument to optional.
https://github.com/laughingman7743/PyAthena/pull/107
* Support pandas.to_sql.
https://github.com/laughingman7743/PyAthena/pull/110
* Fix parameter format of Decimal type.
https://github.com/laughingman7743/PyAthena/pull/123
* Changed date and datetime type conversions to use literal values in all cases.
https://github.com/laughingman7743/PyAthena/pull/127
* Add code format configurations & Apply code formatting.
https://github.com/laughingman7743/PyAthena/pull/138

* Support China region endpoints.
Thanks liangruibupt. (laughingman7743/PyAthenaJDBC/issues/97)