Fix pandas dataframe documentation link
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## Description
Python client wrapper package to access the [web service API](https://github.com/KorAP/Kustvakt/wiki) of the [KorAP Corpus Analysis Platform](https://korap.ids-mannheim.de/) developed at [IDS Mannheim](http://www.ids-mannheim.de/).
Currently, this is no native Python package. Internally, it uses [KorAP's client package for R](http://github.com/KorAP/RKorAPClient)
-via [rpy2](https://rpy2.github.io/). The latter also automatically translates between R data frames (or [tibbles](https://tibble.tidyverse.org/)) and [pandas DataFrames](https://pandas.pydata.org/pandas-docs/stable/getting_started/dsintro.html#dataframe).
+via [rpy2](https://rpy2.github.io/). The latter also automatically translates between R data frames (or [tibbles](https://tibble.tidyverse.org/)) and [pandas DataFrames](https://pandas.pydata.org/docs/reference/api/pandas.DataFrame.html).
## Installation
#### 1. Install R (version >= 3.5)