panic with MockNilError if calls Request.Test and Request.Handler == nil

http.Response.Status of go 1.9+ is different from former version, so remove Status() assert

gjson release a new version, pass all test

Add MD5 and SHA1 supports to response body

Fixed a bug, Result.Time() can only parse time with format RFC3339

All asserts of headers pass tests

All asserts of statusCode pass tests

Remove Response.With, Set *testing.T in NewClient

Replace ptr receiver of all Client methods with value receiver. Assure client is immutable

Pass all test, can use it in productive environment