fixed broken link in readme

[codecov[bot]]

Codecov Report

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

Comparison is base (cd381d7) 86.37% compared to head (99c5d31) 84.92%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #73 +/- ## ========================================== - Coverage 86.37% 84.92% -1.46% ========================================== Files 12 12 Lines 1585 1585 ========================================== - Hits 1369 1346 -23 - Misses 183 207 +24 + Partials 33 32 -1 ``` | [Flag](https://app.codecov.io/gh/go-openapi/swag/pull/73/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=go-openapi) | Coverage Δ | | |---|---|---| | [oldstable](https://app.codecov.io/gh/go-openapi/swag/pull/73/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=go-openapi) | `84.92% <ø> (-1.46%)` | :arrow_down: | | [stable](https://app.codecov.io/gh/go-openapi/swag/pull/73/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=go-openapi) | `84.92% <ø> (-1.46%)` | :arrow_down: | 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=go-openapi#carryforward-flags-in-the-pull-request-comment) to find out more.

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