Correct crc-catalog version

[striezel]

This crate says it works with crc-catalog 1.0.0, but it can't:

   Compiling crc v2.0.0-rc.1 (/opt/crc-rs)
error[E0310]: the parameter type `W` may not live long enough
  --> src/lib.rs:42:20
   |
41 | pub struct Crc<W: Width> {
   |                -- help: consider adding an explicit lifetime bound...: `W: 'static +`
42 |     pub algorithm: &'static Algorithm<W>,
   |                    ^^^^^^^^^^^^^^^^^^^^^ ...so that the reference type `&'static crc_catalog::Algorithm<W>` does not outlive the data it points at

error: aborting due to previous error

For more information about this error, try `rustc --explain E0310`.
error: could not compile `crc`

To learn more, run the command again with --verbose.

This matters when using -Z minimal-versions cargo option.

[akhilles]

@mrhooray I think it's safe to publish 2.0.0. The release candidate hasn't thrown any red flags so far.