style: split the whitespace error return statement

src/config.rs

@@ -138,7 +138,9 @@ fn parse_contents(contents: String) -> Result<Vec<Hotkey>, Error> {
 
             // Error if the command doesn't start with whitespace
             if !command.starts_with(' ') && !command.starts_with('\t') {
-                return Err(Error::InvalidConfig(ParseError::CommandWithoutWhitespace(real_line_no + 1)));
+                return Err(Error::InvalidConfig(ParseError::CommandWithoutWhitespace(
+                    real_line_no + 1,
+                )));
             }
 
             // Push a new hotkey to the hotkeys vector
@@ -393,7 +395,6 @@ pesto
 
     #[test]
     fn test_command_without_whitespace() -> std::io::Result<()> {
-
         let contents = "0
     firefox