docs: added api key setup to README

[codecov-commenter]

Codecov Report

Merging #45 (f9b79d3) into dev (37faa7c) will decrease coverage by 40.84%. The diff coverage is 44.44%.

@@             Coverage Diff             @@
##              dev      #45       +/-   ##
===========================================
- Coverage   85.71%   44.87%   -40.85%     
===========================================
  Files           1        9        +8     
  Lines           7      156      +149     
  Branches        0       17       +17     
===========================================
+ Hits            6       70       +64     
- Misses          1       78       +77     
- Partials        0        8        +8     

Impacted Files	Coverage Δ
src/middleware/bearer.js	15.38% <15.38%> (ø)
src/middleware/basic.js	23.07% <23.07%> (ø)
src/routes/public.js	25.64% <25.64%> (ø)
src/models/user.js	34.37% <34.37%> (ø)
src/routes/user.js	47.61% <47.61%> (ø)
src/models/index.js	81.81% <81.81%> (ø)
src/handlers/error.js	83.33% <83.33%> (ø)
src/handlers/not-found.js	100.00% <100.00%> (ø)
src/server.js	94.11% <100.00%> (+8.40%)	:arrow_up:

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[jeremywbrazell]

merged