Update code of conduct

[vjik]

Code of conduct v2.1

[codecov[bot]]

Codecov Report

Base: 98.05% // Head: 98.05% // No change to project coverage :thumbsup:

Coverage data is based on head (542270f) compared to base (869a224). Patch has no changes to coverable lines.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #113 +/- ## ========================================= Coverage 98.05% 98.05% Complexity 110 110 ========================================= Files 15 15 Lines 309 309 ========================================= Hits 303 303 Misses 6 6 ``` 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=yiisoft). 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=yiisoft)

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