Added encoding to config file

Signed-off-by: Jim Martens <github@2martens.de>

_config.yml

@@ -14,6 +14,7 @@ description: > # this means to ignore newlines until "baseurl:"
 baseurl: "" # the subpath of your site, e.g. /blog
 url: "https://2martens.de" # the base hostname & protocol for your site
 timezone: "Europe/Berlin"
+encoding: utf-8
 collections:
   events:
     output: true