Simplify rails app generation especially Gemfile for test

Author: Sixeight

test/support/application_generator.rb

@@ -59,16 +59,12 @@ def generate_files
           c.gsub!(/(gem '(byebug|web-console|sdoc|jbuilder)')/, "# \\1")
 
           if @version.to_s < '5.2'
-            c.gsub!(/(gem 'sqlite3')/, "# \\1")
+            c.gsub!(/(gem 'sqlite3')/, "\\1, '< 1.4'")
           end
 
           c
         end
 
-        if @version.to_s < '5.2'
-          append_to_file(application.gemfile, "gem 'sqlite3', '< 1.4'")
-        end
-
         rewrite_file(application.path("config/environments/test.rb")) do |c|
           c.sub!(/config\.cache_classes\s*=\s*true/, "config.cache_classes = false")
           c