2.6.0

@bitemyapp
- Reorganized dependencies, decided to break compatibility for Conduit 1.3, Persistent 2.8, and unliftio.
- Moved tests for random() into database-specific test suites.
- Deprecated Language random_, split it into database-specific modules.
@parsonsmatt
- Added support for PersistQueryRead/PersistQueryWrite, enabling type-safe differentation of read and write capabilities.
  - https://github.com/bitemyapp/esqueleto/pull/66
@sestrella
- Added support for arrayAggDistinct and arrayRemove.
  - https://github.com/bitemyapp/esqueleto/pull/65
  - https://github.com/bitemyapp/esqueleto/pull/66
@mheinzel
- Fixed JOIN syntax in the documentation https://github.com/bitemyapp/esqueleto/pull/60
@illmade
- Added instructions for running database specific tests
  - https://github.com/bitemyapp/esqueleto/pull/64
@FintanH
- Removed CPP from the test suite, split the database-specific tests into their own respective modules.
  - https://github.com/bitemyapp/esqueleto/pull/48
- Added support for PostgreSQL's now()
  - https://github.com/bitemyapp/esqueleto/pull/46
- Added a comprehensive examples project to make practical application of Esqueleto easier.
  - https://github.com/bitemyapp/esqueleto/pull/40
@EdwardBetts
- Fixed a spelling error
  - https://github.com/bitemyapp/esqueleto/pull/52