Support for dynamic partials

[athos]

Mustache v1.3.0 introduced dynamic partials.

Dynamic partials are a variant of partials that determine which file to load depending on the data passed at rendering time.

This PR adds support for dynamic partials. It also updates the Mustache spec compliance test suite to the latest.

[codecov]

Codecov Report

Base: 90.92% // Head: 91.15% // Increases project coverage by +0.23% 🎉

Coverage data is based on head (3a82904) compared to base (a652098).
Patch coverage: 98.11% of modified lines in pull request are covered.

❗ Current head 3a82904 differs from pull request most recent head 1490277. Consider uploading reports for the commit 1490277 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #24      +/-   ##
==========================================
+ Coverage   90.92%   91.15%   +0.23%     
==========================================
  Files          12       12              
  Lines         959      984      +25     
  Branches       48       48              
==========================================
+ Hits          872      897      +25     
  Misses         39       39              
  Partials       48       48              

Impacted Files	Coverage Δ
src/pogonos/render.cljc	88.46% <95.65%> (+1.22%)	⬆️
src/pogonos/nodes.cljc	93.75% <100.00%> (+0.41%)	⬆️
src/pogonos/parse.cljc	94.89% <100.00%> (+0.12%)	⬆️
src/pogonos/stringify.cljc	87.91% <100.00%> (+1.00%)	⬆️

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