Change controlling process spec to `Process.dest()`

[codecov[bot]]

Codecov Report

Merging #97 (6d8f962) into master (8cbead2) will increase coverage by 0.07%. Report is 1 commits behind head on master. The diff coverage is n/a.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #97 +/- ## ========================================== + Coverage 88.43% 88.50% +0.07% ========================================== Files 32 32 Lines 1565 1566 +1 ========================================== + Hits 1384 1386 +2 + Misses 181 180 -1 ``` | [Files](https://app.codecov.io/gh/elixir-webrtc/ex_webrtc/pull/97?dropdown=coverage&src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=elixir-webrtc) | Coverage Δ | | |---|---|---| | [lib/ex\_webrtc/peer\_connection.ex](https://app.codecov.io/gh/elixir-webrtc/ex_webrtc/pull/97?src=pr&el=tree&filepath=lib%2Fex_webrtc%2Fpeer_connection.ex&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=elixir-webrtc#diff-bGliL2V4X3dlYnJ0Yy9wZWVyX2Nvbm5lY3Rpb24uZXg=) | `85.35% <ø> (+0.02%)` | :arrow_up: | | [lib/ex\_webrtc/peer\_connection/configuration.ex](https://app.codecov.io/gh/elixir-webrtc/ex_webrtc/pull/97?src=pr&el=tree&filepath=lib%2Fex_webrtc%2Fpeer_connection%2Fconfiguration.ex&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=elixir-webrtc#diff-bGliL2V4X3dlYnJ0Yy9wZWVyX2Nvbm5lY3Rpb24vY29uZmlndXJhdGlvbi5leA==) | `89.33% <ø> (ø)` | | ... and [1 file with indirect coverage changes](https://app.codecov.io/gh/elixir-webrtc/ex_webrtc/pull/97/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=elixir-webrtc) ------ [Continue to review full report in Codecov by Sentry](https://app.codecov.io/gh/elixir-webrtc/ex_webrtc/pull/97?dropdown=coverage&src=pr&el=continue&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=elixir-webrtc). > **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=elixir-webrtc) > `Δ = absolute (impact)`, `ø = not affected`, `? = missing data` > Powered by [Codecov](https://app.codecov.io/gh/elixir-webrtc/ex_webrtc/pull/97?dropdown=coverage&src=pr&el=footer&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=elixir-webrtc). Last update [b75fb0d...6d8f962](https://app.codecov.io/gh/elixir-webrtc/ex_webrtc/pull/97?dropdown=coverage&src=pr&el=lastupdated&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=elixir-webrtc). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=elixir-webrtc).