Summary
Adds support for PostgreSQL while remaining backwards compatible thanks to @jackyzhen!
Changelog
05758b0 Merge pull request #18 from jackyzhen/postgres-support
5bd877a Refactor errors in sql_runner
6e33592 Add test case for multi sql type + refactoring
434d613 Support running on both sql types at once
56c2f08 Make postgres output consistent with mysql
757000a Fix PR comments
7eab526 Change sqlType to string in config + update examples/readme
70ba445 Support postgres via database config
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