update main image

README.md

@@ -4,7 +4,7 @@ Zenbones is a light vim/nvim colorscheme designed to highlight code using
 contrasts and font variations. Colors are tasked only for other roles such as
 diagnostics, diffs, search matches.
 
-![zenbones-main-image](https://user-images.githubusercontent.com/7200153/130731060-85313919-8a04-45e2-813a-ea67f602d1c5.jpg)
+![Zenbones main image](https://user-images.githubusercontent.com/7200153/131045472-05c76909-0071-4c24-bd30-f15da3ae4e82.jpg)
 
 <p align="center">
 <em>A rock garden in <a href="https://en.wikipedia.org/wiki/Ry%C5%8Dan-ji">Ryōan-ji</a>.</em>