chore(release): 6.0.0 [skip ci]

# [6.0.0](https://github.com/CESNET/proxystatistics-simplesamlphp-module/compare/v5.0.0...v6.0.0) (2021-11-22)

### Features

* adapt for PostgreSQL ([d778a96c](https://github.com/CESNET/proxystatistics-simplesamlphp-module/commit/d778a96c2f9b5d1a15b349b0effb4d44fea482d7))

### BREAKING CHANGES

* renamed columns idpId and spId, see migrations scripts