Allow query strings to have nested params and arrays

Add Conn.put_private/3 and Conn.get_private/2.
Allow query strings to have nested params and arrays.

A collection of general API improvements

https://github.com/zhongwencool/maxwell/blob/master/CHANGELOG.md

Support httpc adapter rewrite test case by mock

2.1.0

Update CHANGELOG.md

Release v2.0.0

Merge pull request #16 from zhongwencool/conn_restruct

Merge conn_restruct and publish 2.0.0

Carries the env back after the async request failed

1.0.2

bump to 1.0.2

Support context-type all downcase&Fixed 1.3.0 compile warning

:)

stable version

1.0.0

publish on hex 1.0.0