Fix Mixins icon in readme
Fix Mixins icon in readme

DemonWav/MinecraftDevIntelliJ,DemonWav/MinecraftDev,minecraft-dev/MinecraftDev,DemonWav/MinecraftDev,DemonWav/IntelliJBukkitSupport,minecraft-dev/MinecraftDev,DemonWav/MinecraftDev,minecraft-dev/MinecraftDev,DemonWav/MinecraftDevIntelliJ,DemonWav/MinecraftDevIntelliJ