remove tomli import

[beliaev-maksim]

closes #630

[codecov[bot]]

Codecov Report

Patch and project coverage have no change.

Comparison is base (cc74e5a) 100.00% compared to head (c37e886) 100.00%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #631 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 9 9 Lines 2862 2858 -4 ========================================= - Hits 2862 2858 -4 ``` | [Impacted Files](https://app.codecov.io/gh/getsentry/responses/compare/631?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=getsentry) | Coverage Δ | | |---|---|---| | [responses/\_\_init\_\_.py](https://app.codecov.io/gh/getsentry/responses/compare/631?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=getsentry#diff-cmVzcG9uc2VzL19faW5pdF9fLnB5) | `100.00% <ø> (ø)` | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=getsentry). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=getsentry)

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[Jylanthas]

thanks. this worked for me