Update public api routes

[MuckT]

• Update route for /nft/:id.
• Update route for /address/:address.
• Fix route for /addresses/:addresses.
• Add route for /collection/:slug.
• Add basic route tests for public-routes.test.js.
• Update eslint to require ;.
• Add basic error handler.
• Added validation for req.params on public routes.
• Removed parser on public routes.

[codecov-commenter]

Codecov Report

Merging #36 (2a7e0a0) into dev (37faa7c) will decrease coverage by 48.21%. The diff coverage is 35.84%.

@@             Coverage Diff             @@
##              dev      #36       +/-   ##
===========================================
- Coverage   85.71%   37.50%   -48.22%     
===========================================
  Files           1        3        +2     
  Lines           7       56       +49     
  Branches        0        6        +6     
===========================================
+ Hits            6       21       +15     
- Misses          1       30       +29     
- Partials        0        5        +5     

Impacted Files	Coverage Δ
src/handlers/error-handler.js	16.66% <16.66%> (ø)
src/routes/public-routes.js	25.64% <25.64%> (ø)
src/server.js	90.90% <100.00%> (+5.19%)	:arrow_up:

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