System.stacktrace/0 outside of rescue/catch clauses is deprecated. If you want to support only Elixir v1.7+, you must access __STACKTRACE__ inside a rescue/catch. If you want to support earlier Elixir versions, move System.stacktrace/0 inside a rescue/catch

Supervisor.Spec.supervise/2 is deprecated. Use the new child specifications outlined in the Supervisor module instead

Code.get_docs/2 is deprecated. Code.get_docs/2 always returns nil as its outdated documentation is no longer stored on BEAM files. Use Code.fetch_docs/1 instead

Code.ensure_compiled?/1 is deprecated. Use Code.ensure_compiled/1 instead (see the proper disclaimers in its docs)

:simple_one_for_one strategy is deprecated, please use DynamicSupervisor instead

Supervisor.Spec.worker/2 is deprecated. Use the new child specifications outlined in the Supervisor module instead