Readme: yarn upgrade before install

Signed-off-by: Ruben Barkow-Kuder [email protected]
freifunk · May 19, 2022 · e6e8558 · e6e8558
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commit e6e8558
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diff --git a/README.md b/README.md
@@ -7,6 +7,7 @@ Community Map
 ```
 git clone https://github.com/freifunk/cmap.api.freifunk.net.git
 cd cmap.api.freifunk.net
+yarn upgrade
 yarn install
 node server.js
 ```