Fixed working dir in service.

mastoreddit.service

@@ -4,6 +4,7 @@ Wants=mastoreddit-trigger.timer
 
 [Service]
 Type=oneshot
+WorkingDirectory=/opt/mastoreddit
 Environment="MR_CONFIG=/etc/mastoreddit/config.json"
 Environment="MR_RECENTS=/var/lib/mastoreddit/recents.json"
 ExecStart=/usr/bin/pipenv run /opt/mastoreddit/main.py