chore: Update to 2021 edition (#1188)

tonic-build/Cargo.toml

@@ -5,7 +5,7 @@ description = """
 Codegen module of `tonic` gRPC implementation.
 """
 documentation = "https://docs.rs/tonic-build/0.8.4/tonic_build/"
-edition = "2018"
+edition = "2021"
 homepage = "https://github.com/hyperium/tonic"
 keywords = ["rpc", "grpc", "async", "codegen", "protobuf"]
 license = "MIT"

tonic-build/src/client.rs

@@ -150,7 +150,7 @@ fn generate_connect(service_ident: &syn::Ident, enabled: bool) -> TokenStream {
             /// Attempt to create a new client by connecting to a given endpoint.
             pub async fn connect<D>(dst: D) -> Result<Self, tonic::transport::Error>
             where
-                D: std::convert::TryInto<tonic::transport::Endpoint>,
+                D: TryInto<tonic::transport::Endpoint>,
                 D::Error: Into<StdError>,
             {
                 let conn = tonic::transport::Endpoint::new(dst)?.connect().await?;