fix build warning proposal

[devnexen]

warning: elided lifetime has a name
   --> src/command.rs:137:66
    |
136 | impl<'a> Commands<'a> {
    |      -- lifetime `'a` declared here
137 |     pub fn from_cli_arguments(matches: &'a ArgMatches) -> Result<Commands> {
    |                                                                  ^^^^^^^^ this elided lifetime gets resolved as `'

[sharkdp]

Thank you