warning for apt-get install scrapyd on ubuntu

[mauhai]

As determined over at Scrapy, the apt-get method is based on an outdated package and an install won't work (even if instructions are correctly followed) on Ubuntu 16.04 and above. See scrapy/scrapy#2137 for further information.

I would even suggest to deprecate this part, until the underlying packages have been updated (as done over at the scrapy repo).

[codecov]

Codecov Report

Merging #253 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #253   +/-   ##
======================================
  Coverage    68.4%   68.4%           
======================================
  Files          16      16           
  Lines         861     861           
  Branches      100     100           
======================================
  Hits          589     589           
  Misses        241     241           
  Partials       31      31

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[Digenis]

Actually the ubuntu repo doesn't exist anymore.
I deleted the whole section.
See also #252