Add axis.x.inner

[masayuki0812]

Fix #794.

[codecov-io]

Codecov Report

Merging #2299 into master will increase coverage by 0.03%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #2299      +/-   ##
==========================================
+ Coverage   74.92%   74.95%   +0.03%     
==========================================
  Files          51       51              
  Lines        4227     4233       +6     
==========================================
+ Hits         3167     3173       +6     
  Misses       1060     1060

Impacted Files	Coverage Δ
src/config.js	95.83% <ø> (ø)	⬆️
src/axis.js	95.8% <100%> (+0.05%)	⬆️
src/size.js	93.67% <100%> (ø)	⬆️
src/core.js	89.33% <100%> (ø)	⬆️

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[franciscbalint]

Thank you!

[Mobiletainment]

Looking forward to having this released.
Thank you!

[kt3k]

Looks good to me.

@masayuki0812
Do you think it's ready to release? If you think so, I'll ship it soon.

[masayuki0812]

@kt3k
Thanks for your review. I think this can be released.

[kt3k]

@masayuki0812
Thanks for the confirmation. Released this as v0.4.22.