frost-core does not compile without features

[survived]

How to reproduce:

git checkout frost-core/v1.0.0
cargo check -p frost-core --no-default-features

Output

error[E0432]: unresolved imports `crate::serialization::Deserialize`, `crate::serialization::Serialize`
   --> frost-core/src/keys.rs:20:21
    |
20  |     serialization::{Deserialize, Serialize},
    |                     ^^^^^^^^^^^  ^^^^^^^^^ no `Serialize` in `serialization`
    |                     |
    |                     no `Deserialize` in `serialization`
    |
note: found an item that was configured out
   --> frost-core/src/serialization.rs:171:18
    |
171 | pub(crate) trait Deserialize<C: Ciphersuite> {
    |                  ^^^^^^^^^^^
    = note: the item is gated behind the `serialization` feature
note: found an item that was configured out
   --> frost-core/src/serialization.rs:165:18
    |
165 | pub(crate) trait Serialize<C: Ciphersuite> {
    |                  ^^^^^^^^^
    = note: the item is gated behind the `serialization` feature

error[E0432]: unresolved imports `crate::serialization::Deserialize`, `crate::serialization::Serialize`
   --> frost-core/src/keys/dkg.rs:53:32
    |
53  |     use crate::serialization::{Deserialize, Serialize};
    |                                ^^^^^^^^^^^  ^^^^^^^^^ no `Serialize` in `serialization`
    |                                |
    |                                no `Deserialize` in `serialization`
    |
    = help: consider importing this unresolved item through its public re-export instead:
            crate::keys::Deserialize
note: found an item that was configured out
   --> frost-core/src/serialization.rs:171:18
    |
171 | pub(crate) trait Deserialize<C: Ciphersuite> {
    |                  ^^^^^^^^^^^
    = note: the item is gated behind the `serialization` feature
    = help: consider importing this unresolved item through its public re-export instead:
            crate::keys::Serialize
note: found an item that was configured out
   --> frost-core/src/serialization.rs:165:18
    |
165 | pub(crate) trait Serialize<C: Ciphersuite> {
    |                  ^^^^^^^^^
    = note: the item is gated behind the `serialization` feature

error[E0432]: unresolved imports `crate::serialization::Deserialize`, `crate::serialization::Serialize`
   --> frost-core/src/keys/dkg.rs:170:32
    |
170 |     use crate::serialization::{Deserialize, Serialize};
    |                                ^^^^^^^^^^^  ^^^^^^^^^ no `Serialize` in `serialization`
    |                                |
    |                                no `Deserialize` in `serialization`
    |
    = help: consider importing this unresolved item through its public re-export instead:
            crate::keys::Deserialize
note: found an item that was configured out
   --> frost-core/src/serialization.rs:171:18
    |
171 | pub(crate) trait Deserialize<C: Ciphersuite> {
    |                  ^^^^^^^^^^^
    = note: the item is gated behind the `serialization` feature
    = help: consider importing this unresolved item through its public re-export instead:
            crate::keys::Serialize
note: found an item that was configured out
   --> frost-core/src/serialization.rs:165:18
    |
165 | pub(crate) trait Serialize<C: Ciphersuite> {
    |                  ^^^^^^^^^
    = note: the item is gated behind the `serialization` feature

error[E0432]: unresolved imports `crate::serialization::Deserialize`, `crate::serialization::Serialize`
   --> frost-core/src/round1.rs:17:21
    |
17  |     serialization::{Deserialize, Serialize},
    |                     ^^^^^^^^^^^  ^^^^^^^^^ no `Serialize` in `serialization`
    |                     |
    |                     no `Deserialize` in `serialization`
    |
note: found an item that was configured out
   --> frost-core/src/serialization.rs:171:18
    |
171 | pub(crate) trait Deserialize<C: Ciphersuite> {
    |                  ^^^^^^^^^^^
    = note: the item is gated behind the `serialization` feature
note: found an item that was configured out
   --> frost-core/src/serialization.rs:165:18
    |
165 | pub(crate) trait Serialize<C: Ciphersuite> {
    |                  ^^^^^^^^^
    = note: the item is gated behind the `serialization` feature

error: cannot find attribute `serde` in this scope
   --> frost-core/src/lib.rs:156:7
    |
156 |     #[serde(skip)]
    |       ^^^^^

warning: unused imports: `Error`, `Field`, `Group`
 --> frost-core/src/serialization.rs:3:26
  |
3 | use crate::{Ciphersuite, Error, Field, Group};
  |                          ^^^^^  ^^^^^  ^^^^^
  |
  = note: `#[warn(unused_imports)]` on by default

For more information about this error, try `rustc --explain E0432`.
warning: `frost-core` (lib) generated 1 warning
error: could not compile `frost-core` (lib) due to 5 previous errors; 1 warning emitted

It can be also reproduced by adding frost-core as dependency without default features:

frost-core = { version = "1", default-features = false }

[conradoplg]

Thanks, good catch. I opened a PR to fix it.