feat: replace fn

[erdos]

Implement replace() function. See #133

[codecov]

Codecov Report

Merging #134 (a0c5c7c) into master (0a6db2c) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head a0c5c7c differs from pull request most recent head 551a522. Consider uploading reports for the commit 551a522 to get more accurate results

@@           Coverage Diff           @@
##           master     #134   +/-   ##
=======================================
  Coverage   93.11%   93.12%           
=======================================
  Files          25       25           
  Lines        1904     1906    +2     
  Branches      102      102           
=======================================
+ Hits         1773     1775    +2     
  Misses         29       29           
  Partials      102      102           

Impacted Files	Coverage Δ
src/stencil/functions.clj	87.50% <100.00%> (+0.32%)	⬆️

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