deriving Pread produces unparseable tokens for lifetime bounded slices

[m4b]

In process of testing #107 i discovered e.g.:

#[derive(Debug, Pread)]
struct Data12<'a> {
    ids: &'a [u8],
}

yields:

error: expected `:`, found `,`
   --> tests/tests.rs:273:17
    |
273 | #[derive(Debug, Pread)]
    |                 ^^^^^ expected `:`
    |
    = note: this error originates in the derive macro `Pread` (in Nightly builds, run with -Z macro-backtrace for more info)

error: proc-macro derive produced unparsable tokens
   --> tests/tests.rs:273:17
    |
273 | #[derive(Debug, Pread)]
    |                 ^^^^^

error: could not compile `scroll_derive` (test "tests") due to 2 previous errors