docs: remove unnecessary whitespace

there is an inconsistency in the whitespace surrounding the URL within the `srcset` attribute, hence we always get the snake in light mode

Author: tempewda

README.md

@@ -11,15 +11,11 @@ Generates a snake game from a github user contributions graph
 <picture>
   <source
     media="(prefers-color-scheme: dark)"
-    srcset="
-      https://raw.githubusercontent.com/platane/snk/output/github-contribution-grid-snake-dark.svg
-    "
+    srcset="https://raw.githubusercontent.com/platane/snk/output/github-contribution-grid-snake-dark.svg"
   />
   <source
     media="(prefers-color-scheme: light)"
-    srcset="
-      https://raw.githubusercontent.com/platane/snk/output/github-contribution-grid-snake.svg
-    "
+    srcset="https://raw.githubusercontent.com/platane/snk/output/github-contribution-grid-snake.svg"
   />
   <img
     alt="github contribution grid snake animation"