Add missing benchmark dependency.

ioquatix · ioquatix · commit aa95fa9eb9a4 · 2025-01-30T02:36:09.000+13:00
diff --git a/Gemfile b/Gemfile
@@ -5,6 +5,7 @@ gemspec
 group :development do
   gem "rake-compiler"
   gem "rdoc"
+  gem "benchmark"
 end
 
 group :test do
