Use latest graphql-playground

[sectore]

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[codecov-io]

Codecov Report

Merging #476 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #476      +/-   ##
==========================================
- Coverage   85.71%   85.71%   -0.01%     
==========================================
  Files         111      111              
  Lines       15958    15958              
==========================================
- Hits        13679    13678       -1     
- Misses       2279     2280       +1

Impacted Files	Coverage Δ
juniper/src/http/playground.rs	0% <ø> (-25%)	⬇️

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[LegNeato]

Thanks!