Alexander Myasoedov

Example of behaviour ```shell ./app cmd --flog=yes > Did you mean? `app cmd --flag=yes` exit 1 ``` The suggestion could be match by edit/levenshtein distance.

In addition to current style ```shell ./app cmd --long_flag=1 ``` also support ```shell ./app cmd --long-flag=1 ./app cmd --longflag=1 ```

https://learngraphql.com/basics/query-variables/2

Add favicon.ico

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``` shell [GIN] 2017/11/12 - 17:34:18 | 200 | 189.572µs | 127.0.0.1 | GET /slides.md [GIN] 2017/11/12 - 17:34:18 | 404 | 6.347µs | 127.0.0.1 | GET /favicon.ico ```