Correct link to AUR package :)

Author: blackandred

README.rst

@@ -129,7 +129,7 @@ Projects using RKD
 Alternative ways of installation
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-- `Arch Linux AUR package<https://aur.archlinux.org/packages/riotkit-do/>`_ `made by ragouel<https://github.com/ragouel>`_
+- `Arch Linux AUR package <https://aur.archlinux.org/packages/riotkit-do/>`_ `made by ragouel <https://github.com/ragouel>`_
 
 Releasing
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