docs: Revert '–' to '--' in root README.md

Revert to '--' in root README.md instead of Unicode '–'.  The former
is easier to distinguish in monospace text environments.

diff --git a/README.md b/README.md
index b8b530e..c7b03dc 100644 (file)
--- a/README.md
+++ b/README.md
@@ -5,7 +5,7 @@ Quassel IRC
 
 [Quassel IRC][web-home] is a modern, cross-platform, distributed IRC client,
 meaning that one (or multiple) client(s) can attach to and detach from a
-central core – much like the popular combination of screen and a text-based
+central core -- much like the popular combination of screen and a text-based
 IRC client such as WeeChat, but graphical.
 
 Not only do we aim to bring a pleasurable, comfortable chatting experience to