security/rubygem-doorkeeper: Update from 3.1.0 to 4.2.0

v4.1.0

• Allow customising the Doorkeeper::ApplicationController base controller

v4.0.0

• Fix AssetNotPrecompiled error with Sprockets 4
• Revert "Fix validation error messages"
• Specify Null option to timestamps
• Add support for public client in password grant flow
• Make configuration and specs ORM independent
• Add created_at timestamp to token generation options
• Drop Application#scopes generator and warning, introduced for upgrading doorkeeper from v2 to v3.
• Fix Rails 5 warning messages
• Test against Rails 5 RC1
• Revoke refresh token on access token use. To make use of the new config
• add previous_refresh_token column to oauth_access_tokens:
• rails generate doorkeeper:previous_refresh_token
• Toughen parameters filter with exact match
• Applications admin bugfix
• Fix Ruby Warnings
• Drop attr_accessible from models
• Force all timezones to use UTC to prevent comparison issues.
• Remove config.i18n.fallbacks from engine
• Fix optional belongs_to for Rails 5
• Drops support for Rails 4.1 and earlier
• Drops support for Ruby 2.0
• Bug fix: use the remaining time that a token is still valid when building the redirect URI for the implicit grant flow
• Validation error messages fixes
• Adds foreign key constraints in generated migrations between tokens and grants, and applications
• Support Rails 5

Approved by: swills (mentor)