add some languages for the highlighting

README.md

@@ -3,8 +3,8 @@ applications in my X session but it can be used for other things.
 
 ## Installing
 
-```
+```shell
-cargo install https://gitlab.com/rascul/sup
+$ cargo install https://gitlab.com/rascul/sup
 ```
 
 ## Running
@@ -60,7 +60,7 @@ will be started in the order as read from the file.
 
 ### Example
 
-```
+```toml
 [[app]]
 name = "x resource"
 command = "xrdb"