Wrap static blocks by fragment

[ezhlobo]

Initial issue: #82 Don't add own keys in static blocks

It makes transpiling this

if true
  div First
  div Second

Into this:

true ? (
  <React.Fragment>
    <div>First</div>
    <div>Second</div>
  </React.Fragment>
) : ...

[codecov-io]

Codecov Report

Merging #84 into next will decrease coverage by 0.11%.
The diff coverage is 83.33%.

@@            Coverage Diff             @@
##             next      #84      +/-   ##
==========================================
- Coverage   87.04%   86.92%   -0.12%     
==========================================
  Files          21       21              
  Lines         463      459       -4     
  Branches      112      112              
==========================================
- Hits          403      399       -4     
+ Misses         55       54       -1     
- Partials        5        6       +1

Impacted Files	Coverage Δ
src/block-key.js	90.62% <ø> (-1.49%)	⬇️
src/visitors/Case.js	77.27% <0%> (ø)	⬆️
src/utils/jsx.js	100% <100%> (ø)	⬆️
src/visitors/Conditional.js	100% <100%> (ø)	⬆️
src/visitors/Each.js	96.29% <100%> (ø)	⬆️

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