use start_supervised! to make sure the process is down when next test… #1025

Job	Run time
mix test (Elixir 1.13.x \| Erlang/OTP 22.x)	31s
mix test (Elixir 1.13.x \| Erlang/OTP 23.x)	26s
mix test (Elixir 1.13.x \| Erlang/OTP 24.x)	24s
mix test (Elixir 1.13.x \| Erlang/OTP 25.x)	27s
mix test (Elixir 1.14.x \| Erlang/OTP 23.x)	6m 1s
mix test (Elixir 1.14.x \| Erlang/OTP 24.x)	5m 22s
mix test (Elixir 1.14.x \| Erlang/OTP 25.x)	3m 55s
mix test (Elixir 1.15.x \| Erlang/OTP 24.x)	4m 28s
mix test (Elixir 1.15.x \| Erlang/OTP 25.x)	3m 55s
static analysis (Elixir 1.15.x \| Erlang/OTP 25.x)	22s
mix test windows (Elixir 1.13.x \| Erlang/OTP 22.x)	1m 6s
mix test windows (Elixir 1.13.x \| Erlang/OTP 23.x)	1m 24s
mix test windows (Elixir 1.13.x \| Erlang/OTP 24.x)	1m 25s
mix test windows (Elixir 1.13.x \| Erlang/OTP 25.x)	1m 29s
mix test windows (Elixir 1.14.x \| Erlang/OTP 23.x)	8m 46s
mix test windows (Elixir 1.14.x \| Erlang/OTP 24.x)	6m 30s
mix test windows (Elixir 1.14.x \| Erlang/OTP 25.x)	5m 27s
mix test windows (Elixir 1.15.x \| Erlang/OTP 24.x)	8m 16s
mix test windows (Elixir 1.15.x \| Erlang/OTP 25.x)	6m 0s
	1h 6m 14s

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