Merge branch 'master' of https://github.com/metapsy-project/metapsyTools

Author: MathiasHarrer

README.md

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 ![R CMD Check](https://img.shields.io/badge/R%20CMD%20Check-passing-brightgreen)
-![DOI](https://img.shields.io/badge/DOI-10.5281/zenodo.6566632-blue)](https://doi.org/10.5281/zenodo.6566632)
+[![DOI](https://img.shields.io/badge/DOI-10.5281/zenodo.6566632-blue)](https://doi.org/10.5281/zenodo.6566632)
 
 The `metapsyTools` package facilitates the calculation of effect sizes and meta-analyses based on the [Metapsy](https://www.metapsy.org) database (or databases adhering to the same format).