removed from readme.md references to forked repository

[marcomaggi]

@uael Since you are comitted to maintaining the GNU Autotools infrastructure, there is no need for me to maintain a branch for it.

[codecov]

Codecov Report

Merging #37 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #37   +/-   ##
=======================================
  Coverage   87.58%   87.58%           
=======================================
  Files           6        6           
  Lines         443      443           
  Branches      110      110           
=======================================
  Hits          388      388           
  Misses         23       23           
  Partials       32       32

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[uael]

As you want, I'm not an autotools expert.
I think it's pretty stable and releasable right now, thank you for your help 👍