Update README.md

Fix logo size

Author: davfive

README.md

@@ -1,6 +1,6 @@
 <picture>
    <source media="(prefers-color-scheme: dark)" srcset="./docs/files/gitspaces.dark.png">
-   <img alt="Light and Dark logos" src="./docs/files/gitspaces.light.png">
+   <img width="150" alt="Light and Dark logos" src="./docs/files/gitspaces.light.png">
 </picture>
 
 # gitspaces - A git development workspace manager