Fix missing CONTRIBUTOR name (#2091)

Despite CONTRIBUTORS file being UTF-8 Ture's name
was dropped by our conversion script which does not
handle non-ASCII characters nicely. Re-add it manually.

Author: yadij

CONTRIBUTORS

@@ -518,7 +518,7 @@ Thank you!
     trapexit <trapexit@spawn.link>
     Trever Adams <trever@middleearth.sapphiresunday.org>
     Tsantilas Christos <chtsanti@users.sourceforge.net>
-    <ture@turepalsson.se>
+    Ture Palsson <ture@turepalsson.se>
     Unknown
     Unknown - Debian Project
     Unknown - NetBSD Project