Future Incompat warning

[Skgland]

warning: the following packages contain code that will be rejected by a future version of Rust: buf_redux v0.8.4, nom v4.2.3
note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 103`

$ cargo tree -i nom@4.2.3
nom v4.2.3
└── pgp v0.9.0

$ cargo tree -i buf_redux
buf_redux v0.8.4
└── pgp v0.9.0

[link2xt]

There is an unfinished nom upgrade PR #140.

[Skgland]

I opened #214 for the nom part, though I still need to perform some cleanup.

[dignifiedquire]

I created https://github.com/dignifiedquire/buffer-redux to fix the buf_redux issue.