fix dependency issues and rustc warnings

Cargo.toml

@@ -1,4 +1,5 @@
 [workspace]
+resolver = "2"
 
 members = [
 

crypto/Cargo.toml

@@ -12,11 +12,9 @@ readme = "./README.md"
 description = "Utilities for node addressing and message signing in the aleph-bft package."
 
 [dependencies]
-async-trait = "0.1"
 bit-vec = "0.8"
 codec = { package = "parity-scale-codec", version = "3.0", default-features = false, features = ["derive"] }
 derive_more = { version = "1.0", features = ["full"] }
 log = "0.4"
 
 [dev-dependencies]
-tokio = { version = "1", features = ["macros", "rt", "rt-multi-thread"] }

crypto/src/signature.rs

@@ -39,7 +39,6 @@ pub trait Keychain: Index + Clone + Send + Sync + 'static {
 pub trait PartialMultisignature: Signature {
     type Signature: Signature;
     /// Adds the signature.
-    #[must_use = "consumes the original and returns the aggregated signature which should be used"]
     fn add_signature(self, signature: &Self::Signature, index: NodeIndex) -> Self;
 }
 
@@ -65,7 +64,6 @@ pub type SignatureSet<S> = NodeMap<S>;
 impl<S: Signature> PartialMultisignature for SignatureSet<S> {
     type Signature = S;
 
-    #[must_use = "consumes the original and returns the aggregated signature which should be used"]
     fn add_signature(mut self, signature: &Self::Signature, index: NodeIndex) -> Self {
         self.insert(index, signature.clone());
         self
@@ -398,7 +396,6 @@ impl<T: Signable, MK: MultiKeychain> PartiallyMultisigned<T, MK> {
     }
 
     /// Adds a signature and checks if multisignature is complete.
-    #[must_use = "consumes the original and returns the aggregated signature which should be used"]
     pub fn add_signature(self, signed: Signed<Indexed<T>, MK>, keychain: &MK) -> Self {
         if self.as_signable().hash().as_ref() != signed.as_signable().hash().as_ref() {
             warn!(target: "AlephBFT-signed", "Tried to add a signature of a different object");

examples/blockchain/Cargo.toml

@@ -17,7 +17,5 @@ futures = "0.3"
 futures-timer = "3.0"
 log = "0.4"
 parking_lot = "0.12"
-sha3 = "0.10"
 time = { version = "0.3", features = ["formatting", "macros", "local-offset"] }
 tokio = { version = "1", features = ["macros", "rt", "rt-multi-thread", "io-util", "net", "time"] }
-unsigned-varint = { version = "0.8.0", features = ["futures", "asynchronous_codec"] }