message: [x] add a 'cargo xlint' command
  I keep typing this instead of `cargo x lint`.
  Closes:
  Approved by: sunshowers
diff: @@ -4,3 +4,4 @@ xcheck = "run --package x --bin x -- check"
  xclippy = "run --package x --bin x -- clippy"
  xfmt = "run --package x --bin x -- fmt"
  xtest = "run --package x --bin x -- test"
  +xlint = "run --package x --bin x -- lint"
  