Reference lifetimes are included in type arguments

siderophile will currently output something like
```
<http::uri::scheme::Scheme as HttpTryFrom<&'a[u8]>>::try_from
```
or
```
<futures_io_preview::if_std::Pin<&'amutT> as AsyncRead>::initializer
```
The lifetime `'a` should not be present, and there should be a space between `mut` and `T`.