Upgrade to the Rust 2021 edition (#449)

* upgraded to the 2021 edition

README.md

@@ -49,8 +49,8 @@ The individual libraries are developed to be agnostic about the utilized [Distri
 
 ## Prerequisites
 
-- [Rust](https://www.rust-lang.org/) (>= 1.51)
-- [Cargo](https://doc.rust-lang.org/cargo/) (>= 1.51)
+- [Rust](https://www.rust-lang.org/) (>= 1.56.1)
+- [Cargo](https://doc.rust-lang.org/cargo/) (>= 1.56.0)
 
 ## Getting Started
 
@@ -78,7 +78,7 @@ cargo doc --document-private-items --no-deps --open
 [package]
 name = "iota_identity_example"
 version = "1.0.0"
-edition = "2018"
+edition = "2021"
 
 [dependencies]
 identity = { git = "https://github.com/iotaledger/identity.rs", branch = "main", features = ["account"]}

bindings/wasm/Cargo.toml

@@ -2,7 +2,7 @@
 name = "identity-wasm"
 version = "0.4.0"
 authors = ["IOTA Stiftung"]
-edition = "2018"
+edition = "2021"
 homepage = "https://www.iota.org"
 keywords = ["iota", "tangle", "identity", "wasm"]
 license = "Apache-2.0"

examples/Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "examples"
 version = "0.1.0"
-edition = "2018"
+edition = "2021"
 publish = false
 
 [dependencies]

identity-account/Cargo.toml

@@ -2,7 +2,7 @@
 name = "identity-account"
 version = "0.4.0"
 authors = ["IOTA Stiftung"]
-edition = "2018"
+edition = "2021"
 homepage = "https://www.iota.org"
 keywords = ["iota", "tangle", "identity"]
 license = "Apache-2.0"

identity-comm/Cargo.toml

@@ -2,7 +2,7 @@
 name = "identity-comm"
 version = "0.4.0"
 authors = ["IOTA Stiftung"]
-edition = "2018"
+edition = "2021"
 homepage = "https://www.iota.org"
 keywords = ["iota", "tangle", "identity"]
 license = "Apache-2.0"

identity-core/Cargo.toml

@@ -2,7 +2,7 @@
 name = "identity-core"
 version = "0.4.0"
 authors = ["IOTA Stiftung"]
-edition = "2018"
+edition = "2021"
 homepage = "https://www.iota.org"
 keywords = ["iota", "tangle", "identity"]
 license = "Apache-2.0"

identity-credential/Cargo.toml

@@ -2,7 +2,7 @@
 name = "identity-credential"
 version = "0.4.0"
 authors = ["IOTA Stiftung"]
-edition = "2018"
+edition = "2021"
 homepage = "https://www.iota.org"
 keywords = ["iota", "tangle", "identity"]
 license = "Apache-2.0"

identity-did/Cargo.toml

@@ -2,7 +2,7 @@
 name = "identity-did"
 version = "0.4.0"
 authors = ["IOTA Stiftung"]
-edition = "2018"
+edition = "2021"
 homepage = "https://www.iota.org"
 keywords = ["iota", "tangle", "identity"]
 license = "Apache-2.0"

identity-diff/Cargo.toml

@@ -2,7 +2,7 @@
 name = "identity-diff"
 version = "0.4.0"
 authors = ["IOTA Stiftung"]
-edition = "2018"
+edition = "2021"
 homepage = "https://www.iota.org"
 keywords = ["iota", "tangle", "identity"]
 license = "Apache-2.0"

identity-iota/Cargo.toml

@@ -2,7 +2,7 @@
 name = "identity-iota"
 version = "0.4.0"
 authors = ["IOTA Stiftung"]
-edition = "2018"
+edition = "2021"
 homepage = "https://www.iota.org"
 keywords = ["iota", "tangle", "identity"]
 license = "Apache-2.0"

identity/Cargo.toml

@@ -3,7 +3,7 @@ name = "identity"
 version = "0.4.0"
 authors = ["IOTA Stiftung"]
 documentation = "https://wiki.iota.org/identity.rs/introduction"
-edition = "2018"
+edition = "2021"
 homepage = "https://www.iota.org"
 keywords = ["iota", "tangle", "identity", "did"]
 license = "Apache-2.0"

libjose/Cargo.toml

@@ -2,7 +2,7 @@
 name = "libjose"
 version = "0.1.0"
 authors = ["IOTA Stiftung"]
-edition = "2018"
+edition = "2021"
 homepage = "https://www.iota.org"
 keywords = ["iota", "tangle", "identity", "jose", "jwa", "jwe", "jwk", "jwm", "jws", "jwt"]
 license = "Apache-2.0"