Update README.md

Error: kyu_8/closest_elevator/README.md:21 MD040/fenced-code-language Fenced code blocks should have a language specified [Context: "```"] https://github.com/DavidAnson/markdownlint/blob/v0.36.1/doc/md040.md

kyu_8/closest_elevator/README.md

@@ -18,7 +18,7 @@ You can assume that the inputs will always be valid integers between 0-2.
 
 ## Examples
 
-```
+```bash
 left right call   result
   0    1     0    "left"
   0    1     1    "right"