Allow setting env vars with same name for different branches in v3 API

Author: AndriiMysko

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

@@ -10,7 +10,7 @@ class Models::EnvVar < Travis::Settings::Model
     validates :name, presence: true
     validates_each :id, :name do |record, attr, value|
       others = record.repository.env_vars.select { |ev| ev.id != record.id }
-      record.errors.add(:base, :duplicate_resource) if others.find { |ev| ev.send(attr) == record.send(attr) }
+      record.errors.add(:base, :duplicate_resource) if others.find { |ev| ev.send(attr) == record.send(attr) && ev.send(:branch) == record.send(:branch) }
     end
 
     def repository