Get ready for production

[v-kolesnikov]

• Fix environ dependency
• Start server on 0.0.0.0

[codecov]

Codecov Report

Merging #7 into master will increase coverage by 0.3%.
The diff coverage is 100%.

@@           Coverage Diff            @@
##           master      #7     +/-   ##
========================================
+ Coverage      92%   92.3%   +0.3%     
========================================
  Files           2       2             
  Lines          25      26      +1     
  Branches        1       1             
========================================
+ Hits           23      24      +1     
  Misses          1       1             
  Partials        1       1

Impacted Files	Coverage Δ
src/pablito/server.clj	92.85% <100%> (+0.54%)	⬆️

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