add flex property on filler component

[johanavril]

API reference

[codecov-io]

Codecov Report

Merging #183 into master will increase coverage by 3.27%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #183      +/-   ##
==========================================
+ Coverage   73.41%   76.68%   +3.27%     
==========================================
  Files          24       27       +3     
  Lines        1903     2145     +242     
==========================================
+ Hits         1397     1645     +248     
+ Misses        423      403      -20     
- Partials       83       97      +14

Impacted Files	Coverage Δ
linebot/flex.go	47.61% <100%> (+4.24%)	⬆️
linebot/send_message.go	90.44% <0%> (-2.84%)	⬇️
linebot/client.go	72.09% <0%> (-0.88%)	⬇️
linebot/demographic_filter.go	87.75% <0%> (ø)
linebot/insight.go	100% <0%> (ø)
linebot/recipient.go	81.48% <0%> (ø)
linebot/message.go	82.74% <0%> (+0.17%)	⬆️
linebot/event.go	88.02% <0%> (+0.29%)	⬆️
linebot/imagemap.go	94.44% <0%> (+1.11%)	⬆️
linebot/response.go	70.3% <0%> (+1.36%)	⬆️
... and 2 more

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[johanavril]

hi, I add test but the diff hit on codecov still 0%. Could anyone help me? Thank you.

[oklahomer]

@johanavril That probably is due to the absence of JSON marshaling test. Unmarshaling is tested in the new lines while MarshalJSON is not so the test actually passes even when https://github.com/line/line-bot-sdk-go/pull/183/files#diff-8e69f58e71fe924131e7883eb77898b7R418 is removed.

[johanavril]

@oklahomer Ok thank you, then is it fine if I add a json marshaling test ? Because there aren't any json marshalling tests before.

[oklahomer]

@johanavril Thank you for the offer. Yes, I think that would be better.

[johanavril]

now all checks have passed, thanks for the help @oklahomer could you review the PR ? thank you

[oklahomer]

Thank you for the changes. LGTM 👍