bind address default to 127.0.0.1

[Digenis]

Fixes #220

[codecov-io]

Codecov Report

Merging #226 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #226   +/-   ##
=======================================
  Coverage   67.66%   67.66%           
=======================================
  Files          15       15           
  Lines         835      835           
  Branches       91       91           
=======================================
  Hits          565      565           
  Misses        240      240           
  Partials       30       30

Impacted Files	Coverage Δ
scrapyd/app.py	100% <100%> (ø)	⬆️

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