Gemfile in index_shotgun-0.1.0 vs Gemfile in index_shotgun-0.2.0

@@ -1,4 +1,21 @@
 source "https://rubygems.org"
 
 # Specify your gem's dependencies in index_shotgun.gemspec
 gemspec
+
+group :mysql do
+  gem "mysql2", "< 0.4.0"
+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