update readme

README.Rmd

@@ -16,7 +16,6 @@ output: github_document
 
 [![Last-changedate](https://img.shields.io/badge/last%20change-`r gsub('-', '--', Sys.Date())`-yellowgreen.svg)](/commits/master)
 
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 <!-- README.md is generated from README.Rmd. Please edit that file -->
 
 ```{r, echo = FALSE}
@@ -43,6 +42,7 @@ This package provides functions to manipulate PDF files:
 
 This package is still under development and this repository contains a development version of the R package *staplr*.
 
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 ## Installation
 
 #### First Install pdftk