Update README file (#80)

README.md

@@ -89,9 +89,9 @@ If you find it useful, please star or tell others about this repo.
 
 ## Acknowledgements
 
-+ [@mathiasbynens](https://github.com/mathiasbynens) for his amazing [dotfiles](https://github.com/mathiasbynens/dotfiles)
-+ [@mikaelgustafsson](https://mikaelgustafsson.art) for his amazing [wallpapers](https://www.instagram.com/mklgustafsson/)
-+ [@robbyrussell](https://github.com/robbyrussell) for the guides of [Oh My Zsh](https://github.com/robbyrussell/oh-my-zsh)
+- [@mathiasbynens](https://github.com/mathiasbynens) for his amazing [dotfiles](https://github.com/mathiasbynens/dotfiles)
+- [@robbyrussell](https://github.com/robbyrussell) for the guides of [Oh My Zsh](https://github.com/robbyrussell/oh-my-zsh)
+- [@Wallheaven](https://wallhaven.cc) for their amazing [wallpaper](https://wallhaven.cc/w/6k5m8x)
 
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