readme: replace 'unknown methods'

because the methods aren't unknown to everybody, they're just rare / arcane / secret ... (as opposed to commonly-known / standard / classic / orthodox ...)
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@ -17,7 +17,7 @@ src="https://img.shields.io/badge/license-MIT-blue.svg"></a>
<img src="https://s3.amazonaws.com/titlepages.leanpub.com/bash/hero" width="40%" align="right">
</a>
The goal of this book is to document known and unknown methods of doing various tasks using only built-in `bash` features. Using the snippets from this bible can help remove unneeded dependencies from scripts and in most cases make them faster. I came across these tips and discovered a few while developing [neofetch](https://github.com/dylanaraps/neofetch), [pxltrm](https://github.com/dylanaraps/pxltrm) and other smaller projects.
The goal of this book is to document commonly-known and lesser-known methods of doing various tasks using only built-in `bash` features. Using the snippets from this bible can help remove unneeded dependencies from scripts and in most cases make them faster. I came across these tips and discovered a few while developing [neofetch](https://github.com/dylanaraps/neofetch), [pxltrm](https://github.com/dylanaraps/pxltrm) and other smaller projects.
The snippets below are linted using `shellcheck` and tests have been written where applicable. Want to contribute? Read the [CONTRIBUTING.md](https://github.com/dylanaraps/pure-bash-bible/blob/master/CONTRIBUTING.md). It outlines how the unit tests work and what is required when adding snippets to the bible.