Add missing syntax tag

This will turn on syntax highlighting for the inline comments.

README.md

@@ -8,7 +8,7 @@ Manage daily standups from the command line.
 
 With [Stack](http://docs.haskellstack.org/en/stable/README/) installed, clone the repository and run:
 
-```
+```bash
 $ stack setup # Only if you haven't run this before
 $ stack build # Find the path the executable is installed
 $ ln -s /usr/local/sbin CLI_PATH # Use executable path from above