feat: resolve a template tag of an injected named slot

[ktsn]

If the <template> element is an injected named slot, it should be disappeared from the rendered output.

Reference:

• https://vuejs.org/v2/guide/components-slots.html#Named-Slots

[codecov]

Codecov Report

Merging #45 into master will increase coverage by 0.08%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #45      +/-   ##
==========================================
+ Coverage   64.74%   64.82%   +0.08%     
==========================================
  Files          52       52              
  Lines        1713     1717       +4     
  Branches      399      393       -6     
==========================================
+ Hits         1109     1113       +4     
  Misses        588      588              
  Partials       16       16

Impacted Files	Coverage Δ
src/view/components/Child.vue	87.5% <100%> (+4.16%)	⬆️

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