v1.7.0

fixed __toString method in Response

v1.6.9

contract bug

v1.6.8

added get account balance

v1.6.7

fixed json bug

v1.6.6

returning  from setRetryOnRateLimit

v1.6.5

added retry on rate limit option

v1.6.4

fixed comment error

v1.6.3

updated turk response with some more options

v1.6.2

added requester contract

v1.6.1

Update composer.json