Correctly processing extension capabilities (fixes #384)

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (00be011) 87.58% compared to head (5d2ea93) 88.23%. Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #389 +/- ## ========================================== + Coverage 87.58% 88.23% +0.65% ========================================== Files 4 4 Lines 596 595 -1 ========================================== + Hits 522 525 +3 + Misses 55 53 -2 + Partials 19 17 -2 ``` | [Flag](https://app.codecov.io/gh/aerokube/ggr/pull/389/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aerokube) | Coverage Δ | | |---|---|---| | [go](https://app.codecov.io/gh/aerokube/ggr/pull/389/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aerokube) | `88.23% <100.00%> (+0.65%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aerokube#carryforward-flags-in-the-pull-request-comment) to find out more.

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