Render updated Readme

Change-Id: I0013c3d78586ec56e943e85e4f57baa0cc2cd43c
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 You can use this format in R Markdown documents by installing this package as follows:
 
 ``` r
-install_git("https://korap.ids-mannheim.de/gerrit/IDS-Mannheim/revealjs")
+devtools::install_git("https://korap.ids-mannheim.de/gerrit/IDS-Mannheim/revealjs")
 ```
 
 To create a [reveal.js](https://revealjs.com/) presentation from R Markdown you specify the `revealjs_presentation` output format in the front-matter of your document. You can create a slide show broken up into sections by using the `#` and `##` heading tags (you can also create a new slide without a header using a horizontal rule (`----`). For example here's a simple slide show: