Update README.md

fixed installation

README.md

@@ -5,10 +5,10 @@ The extension adds the following magic words to your mediawiki:
 * gndshowlite: takes in the p-value you want to show and only shows this information (fits great if you want to display local data from semantic mediawiki together with data from wikidata)
 
 ## Installation
-1. Clone this repo via git clone https://github.com/julianhocker/GNDShow.git into extensions 
-2. Add wfLoadExtension('GNDShow'); to your LocalSettings.php
+1. Add "freearhey/wikidata": "3.2" to your composer.json of the wiki in the section "require"
+2. Run composer update --no-dev
+3. Clone this repo via git clone https://github.com/julianhocker/GNDShow.git into extensions  
+4. Add wfLoadExtension('GNDShow'); to your LocalSettings.php
 
 ## Known issues 
 * Please open issues if you encounter problems 
-* I will work more on this, planning to add some more data you can get from the GND
-* File names are wrong