Bcpandas

General
* Removed `read_sql` after deprecating it in v0.5.0. It is now only available in the `benchmarks` code
* Removed VS Code DockerFile and Docker-Compose backends; didn't fully work anyway

Testing
* Streamlined creation of SQL database in Docker with `docker-py` library and new `DockerDB` class
* Added test for duplicate column names

Docs
* Enhanced section about testing

General
* Replaced the `executable` parameter with a `bcp_path` parameter that lets the user specify the full path to the BCP utility, in case it is not available in the PATH environment variable

* forgot to change version number in code

Enhancements
* Support for database columns missing or out of order in the pandas DataFrame (big enhancement)
* Support for boolean `True` and `False` values in the pandas DataFrame
* Integrated with codecov.io

Enhancements
* Added parameter to specify which shell to use for the BCP command. Useful on Linux if BCP is only found in PATH for some shells and not others

General
* Deprecated the `read_sql` function
* Added support for Python 3.8

Documentation
* Added section about not using the bcpandas `read_sql`
* Added benchmark for `read_sql`