Fix image in readme on github

Apparently it was moved in wiki

README.md

@@ -1,4 +1,4 @@
-# [![ZNC](https://wiki.znc.in/resources/assets/wiki.png)](https://znc.in) - An advanced IRC bouncer
+# [![ZNC](logo.png)](https://znc.in) - An advanced IRC bouncer
 
 [![GitHub Workflow Status](https://img.shields.io/github/actions/workflow/status/znc/znc/build.yml?branch=master&label=linux)](https://github.com/znc/znc/actions/workflows/build.yml)
 [![Jenkins Build Status](https://img.shields.io/jenkins/s/https/jenkins.znc.in/job/znc/job/znc/job/master.svg?label=freebsd)](https://jenkins.znc.in/job/znc/job/znc/job/master/)