docs(readme): fix `rstcheck` violation [skip ci]
authorImran Iqbal <iqbalmy@hotmail.com>
Sun, 4 Oct 2020 20:43:34 +0000 (21:43 +0100)
committerImran Iqbal <iqbalmy@hotmail.com>
Sun, 4 Oct 2020 20:43:34 +0000 (21:43 +0100)
https://travis-ci.org/github/myii/arvados-formula/builds/731605195#L255

```
docs/README.rst:35: (ERROR/3) Unknown target name: "special notes".
```


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