dark mode logo

Author: tidwall

.github/images/logo-dark.png

@@ -1,7 +1,9 @@
 <p align="center">
-<img 
-    src="logo.png" 
-    width="240" height="78" border="0" alt="GJSON">
+<picture>
+  <source media="(prefers-color-scheme: dark)" srcset="/.github/images/logo-dark.png">
+  <source media="(prefers-color-scheme: light)" srcset="/.github/images/logo-light.png">
+  <img src="/.github/images/logo-light.png" width="240" alt="GJSON" >
+</picture>
 <br>
 <a href="https://godoc.org/github.com/tidwall/gjson"><img src="https://img.shields.io/badge/api-reference-blue.svg?style=flat-square" alt="GoDoc"></a>
 <a href="https://tidwall.com/gjson-play"><img src="https://img.shields.io/badge/%F0%9F%8F%90-playground-9900cc.svg?style=flat-square" alt="GJSON Playground"></a>