bump bluebird: 2.3.6 => 2.8.2
bump bluebird: 2.3.6 => 2.8.2

Pick up various bug fixes and performance improvements.

fyquah95/blpapi-http,flojdek/blpapi-http,flojdek/blpapi-http,flojdek/blpapi-http,bloomberg/blpapi-http,bloomberg/blpapi-http,bloomberg/blpapi-http,flojdek/blpapi-http,flojdek/blpapi-http,fyquah95/blpapi-http,fyquah95/blpapi-http