fix(bunny): headers property needs to exist #1793

Job	Run time
action_pack / ubuntu-latest	1m 41s
action_view / ubuntu-latest	1m 31s
active_job / ubuntu-latest	4m 23s
active_model_serializers / ubuntu-latest	55s
active_record / ubuntu-latest	1m 23s
active_support / ubuntu-latest	1m 59s
all / ubuntu-latest	2m 15s
aws_sdk / ubuntu-latest	5m 58s
base / ubuntu-latest	1m 37s
concurrent_ruby / ubuntu-latest	3m 16s
delayed_job / ubuntu-latest	50s
ethon / ubuntu-latest	3m 53s
excon / ubuntu-latest	1m 50s
faraday / ubuntu-latest	3m 47s
grape / ubuntu-latest	5m 43s
graphql / ubuntu-latest	1m 39s
gruf / ubuntu-latest	46s
http / ubuntu-latest	1m 36s
http_client / ubuntu-latest	45s
koala / ubuntu-latest	47s
lmdb / ubuntu-latest	1m 5s
net_http / ubuntu-latest	1m 40s
rack / ubuntu-latest	1m 13s
rails / ubuntu-latest	2m 3s
restclient / ubuntu-latest	3m 6s
rspec / ubuntu-latest	1m 36s
sinatra / ubuntu-latest	3m 54s
	1h 1m 11s

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