Support 07/08 Insight API.

[kkdai]

fix #171
Add support for https://developers.line.biz/en/news/#new-messaging-api-endpoints-for-friend-statistics-2019-07-08

Get number of message deliveries
Get number of followers
Get friend demographics

[codecov-io]

Codecov Report

Merging #172 into master will increase coverage by 0.81%.
The diff coverage is 92%.

@@            Coverage Diff             @@
##           master     #172      +/-   ##
==========================================
+ Coverage   73.38%   74.19%   +0.81%     
==========================================
  Files          24       25       +1     
  Lines        1901     1984      +83     
==========================================
+ Hits         1395     1472      +77     
- Misses        423      426       +3     
- Partials       83       86       +3

Impacted Files	Coverage Δ
linebot/client.go	72.97% <ø> (ø)	⬆️
linebot/insight.go	100% <100%> (ø)
linebot/response.go	69.87% <75%> (+0.93%)	⬆️
linebot/flex.go	43.37% <0%> (+0.69%)	⬆️
linebot/imagemap.go	94.44% <0%> (+1.11%)	⬆️

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[kkdai]

Hi @k2wanko @suzuki-shunsuke
Would you please help to review?
Thank you.

[kkdai]

Hi @k2wanko @suzuki-shunsuke
Any update for this PR?
Thank you

[iamgoangle]

LGTM. waiting project owner to review and approve.

[k2wanko]

@nasa9084 Can you review this PR?

[CLAassistant]

All committers have signed the CLA.

[nasa9084]

@iamgoangle please sign CLA, we cannot merge this PR until you sign

[kkdai]

Fixed all, let me know if any question.

[oklahomer]

I think I should be taking a look at this p-r from here.
Some minor comments are added, but things look good overall.

[nasa9084]

LGTM

[kkdai]

Hi @oklahomer ,
Please let me know if any question about this PR

[oklahomer]

LGTM 👍
Thank you for your contribution.