Update README instructions to install cups

In order to install cups library on Ubuntu it is necessary to perform `apt-get install libcups2-dev`.
m0wfo · Aug 28, 2018 · 266ece9 · 266ece9
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diff --git a/README.rdoc b/README.rdoc
@@ -8,7 +8,7 @@ Print stuff in Ruby. This gem is a C wrapper for the CUPS API.
 
 To build the extensions, you need the cups library installed, and the cups-config programme in your path. On OS X you should have everything you need. On Debian/Ubuntu, running:
 
- sudo apt-get install libcups-dev
+ sudo apt-get install libcups2-dev
 
 will set everything up.