undefined method starts_with when api service unavailable  #24

NoMethodError

undefined method `start_with?' for nil:NilClass
/app/vendor/bundle/ruby/2.6.0/gems/phaxio-2.0.1/lib/phaxio/client.rb:54:in `handle_response'
/app/vendor/bundle/ruby/2.6.0/gems/phaxio-2.0.1/lib/phaxio/client.rb:34:in `request'
/app/vendor/bundle/ruby/2.6.0/gems/phaxio-2.0.1/lib/phaxio/resources/fax.rb:165:in `create'