remove `skip_bundle` option from plugin generator

Because `bundle install` is not executed regardless of whether the option
is specified or not.

Ref: fbd1e98c

railties/lib/rails/generators/app_base.rb

@@ -42,9 +42,6 @@ def self.add_shared_options_for(name)
         class_option :skip_gemfile,       type: :boolean, default: false,
                                           desc: "Don't create a Gemfile"
 
-        class_option :skip_bundle,        type: :boolean, aliases: "-B", default: false,
-                                          desc: "Don't run bundle install"
-
         class_option :skip_git,           type: :boolean, aliases: "-G", default: false,
                                           desc: "Skip .gitignore file"
 

railties/lib/rails/generators/rails/app/app_generator.rb

@@ -175,6 +175,9 @@ class AppGenerator < AppBase # :nodoc:
       class_option :api, type: :boolean,
                          desc: "Preconfigure smaller stack for API only apps"
 
+      class_option :skip_bundle, type: :boolean, aliases: "-B", default: false,
+                                 desc: "Don't run bundle install"
+
       def initialize(*args)
         super