[Ddclient-support] [ddclient/ddclient] 42c213: Update install instructions

[Sandro <no...@gi...>]

  Branch: refs/heads/master
  Home:   https://github.com/ddclient/ddclient
  Commit: 42c21391f32142ec9662da26ab0b63563afb260c
      https://github.com/ddclient/ddclient/commit/42c21391f32142ec9662da26ab0b63563afb260c
  Author: Sandro Jäckel <san...@gm...>
  Date:   2020-05-27 (Wed, 27 May 2020)

  Changed paths:
    M README.md

  Log Message:
  -----------
  Update install instructions

Closes #144