Update README.md

README.md

@@ -197,7 +197,7 @@ This plugin will rename your installation to \'My Workspace\' and include matchi
 
 If icons or Unsplash images are not displaying you may need to set the CSP on your server. Add the line below in the `.htaccess` file found in the root directory of your Kanboard installation.
 
-```
+```apache
 Header set Content-Security-Policy "default-src 'self' 'unsafe-inline'; script-src 'self' 'unsafe-inline' https; connect-src 'self'; img-src 'self' data:; style-src 'unsafe-inline' https *; base-uri 'self'; form-action 'self'; frame-src 'self' https; child-src 'self';"
 ```