Update decoding error message

Update RequestCaller.swift

update error info for decoding.

Fixed crash if response data is null.

2.3.2

although it's unusual to see 200 without any response, it's still pos…

Xcode 9.3 update

Just increase the version to overlap 2.2 which is not actually exist.

2.1.3

added a default  URLSessionConfiguration (#7)

Bug fixed on ErrorModel

patch error model (#6)

make errorCode optional (patch)

Swift package manager support. And refactor

Features/swift package manager (#5)

* just return httpResponse

* Refactor, added URLSessionConfiguration as initializer parameter and added RawResponse model.

* update Example

* update gitignore for swift

* added swift package manager support

* update Example

* just ignore the swift package test for now

* update .travis

Moving to Codable

removing objectmapper and alamofire dependency