Release 0.5.0

This release contains 2 big updates:

1. Bump of different libraries to follow Typelevel version cycle:
   catsCore = "1.5.0"
   circe = "0.10.1"
   doobie = "0.6.0"
   lolhttp = "0.12.0"
   That demanded some code modifiactions and the most important are:

   • doobie Transactor is now a cats Resource and doesn't have a shutdown method, instead we use Resource.allocated and obtain an IO to release the Hikari Pool
   • doobie now needs a dedicated thread pool and dedicated ContextShift
   • now we log each Doobie query for debug purposes
   • xmap of circe is deprecated => we should use imap
   • fs2.Scheduler is replaced by cats.effect.IO.timer and now needs and implicit cats.effect.Timer in the scope
   • cats-mtl was removed as FunctorFilter was moved to cats-core
   • couple of logs were added

2. We added a Cron scheduler that lives in a separate cron module.

   • short specification:
     1. Compute next CRON event for this job (based on the CRON expression parsed by https://github.com/alonsodomin/cron4s)
     2. Wait for the CRON event to occur
     3. Create a CronContext and run the job side-effect
     4. Wait on the side-effect Future result
   • REST API are available on https://documenter.getpostman.com/view/3548308/RznCs12X
   • it has some minimalistic server side rendering UI
   • for an example check examples/src/main/scala/com/criteo/cuttle/examples/HelloCronScheduling.scala