Gemfile in index_shotgun-0.2.1 vs Gemfile in index_shotgun-0.3.0

@@ -1,21 +1,6 @@
 source "https://rubygems.org"
 
 # Specify your gem's dependencies in index_shotgun.gemspec
 gemspec
 
-group :mysql do
-  gem "mysql2"
-end
-
-group :oracle do
-  gem "activerecord-oracle_enhanced-adapter"
-  gem "ruby-oci8"
-end
-
-group :postgresql do
-  gem "pg"
-end
-
-group :sqlite3 do
-  gem "sqlite3"
-end
+eval(Pathname("gemfiles/databases.gemfile").read)