Update README.md

An update is needed before installing varnish
10 years ago · 1bc390a50e
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@ -452,6 +452,7 @@ via the Maps API.
 Add CartoDB Varnish PPA and install it:
 ```bash
 sudo add-apt-repository  ppa:cartodb/varnish
+sudo apt-get update
 sudo apt-get install varnish=2.1.5.1-cdb1 #or any version <3.x
 ```