docs: Revert '–' to '--' in root README.md
authorShane Synan <digitalcircuit36939@gmail.com>
Sun, 17 Jun 2018 17:38:12 +0000 (12:38 -0500)
committerManuel Nickschas <sputnick@quassel-irc.org>
Sun, 17 Jun 2018 20:06:25 +0000 (22:06 +0200)
Revert to '--' in root README.md instead of Unicode '–'.  The former
is easier to distinguish in monospace text environments.


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