Gemfile in rbnacl-3.2.0 vs Gemfile in rbnacl-3.3.0

@@ -7,11 +7,7 @@
   gem "guard-rspec"
 end
 
 group :test do
   gem "coveralls", require: false
-  gem "rbnacl-libsodium"
-end
-
-group :development, :test do
-  gem "rubocop"
+  gem "rbnacl-libsodium", ENV["LIBSODIUM_VERSION"]
 end