Problem: pigsty.rb requires csv gem

And it's not available by default.

Solution: include it in the Gemfile
(but not in gemspec as it is not part of the pgpm gem)

Author: yrashk

Gemfile

@@ -14,3 +14,5 @@ gem "rubocop", "~> 1.21"
 gem "debug", "~> 1.9"
 
 gem "rbs", "~> 3.6"
+
+gem "csv", "~> 3.3"