Add OSS credit usage setting

Author: AndriiMysko

lib/travis/api/v3/models/organization_preferences.rb

@@ -4,6 +4,8 @@ module Travis::API::V3
   class Models::OrganizationPreferences < Models::JsonSlice
     child Models::Preference
 
+    attribute :consume_oss_credits, Boolean, default: true
+
     # whether to show insights about the organization's private repositories to
     # only admins, all members of the organization, or everybody (public) (note:
     # insights about public repositories are always public)

lib/travis/api/v3/models/user_preferences.rb

@@ -6,6 +6,8 @@ class Models::UserPreferences < Models::JsonSlice
 
     attribute :build_emails, Boolean, default: true
 
+    attribute :consume_oss_credits, Boolean, default: true
+
     # whether to show insights about the user's private repositories to
     # everybody or keep them only for the user (note: insights about public
     # repositories are always public)