Move activerecord gem to dev and test envs only.

Author: codrin-mares

Gemfile

@@ -5,5 +5,8 @@ source "https://rubygems.org"
 # Specify your gem's dependencies in activerecord-cte.gemspec
 gemspec
 
-gem "activerecord", "6.1.7.9"
 gem "pg"
+
+group :development, :test do
+  gem "activerecord", "6.1.7.9"
+end