Bump async-std from 1.7.0 to 1.8.0

Bumps [async-std](https://github.com/async-rs/async-std) from 1.7.0 to 1.8.0.
- [Release notes](https://github.com/async-rs/async-std/releases)
- [Changelog](https://github.com/async-rs/async-std/blob/master/CHANGELOG.md)
- [Commits](async-rs/async-std@v1.7.0...v1.8.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Cargo.toml

@@ -31,7 +31,7 @@ async-channel = "1"
 async-compat = "0.1"
 async-compression = {version = "0.3", features = ["xz", "futures-bufread", "stream"]}
 async-io = "1.3"
-async-std = {version = "1.7.0", features = ["unstable", "attributes", "tokio03"]}
+async-std = {version = "1.8.0", features = ["unstable", "attributes", "tokio03"]}
 async-trait = "0.1"
 async-tungstenite = {version = "0.10.0", features = ["async-std-runtime"]}
 base64 = "0.13"

tremor-cli/Cargo.toml

@@ -20,7 +20,7 @@ matches = "0.1"
 pretty_assertions = "0.6.1"
 
 [dependencies]
-async-std = {version = "1.7", features = ["unstable"]}
+async-std = {version = "1.8", features = ["unstable"]}
 clap = {version = "3.0.0-beta.2", features = ["yaml", "color"]}
 clap_generate = "3.0.0-beta.2"
 difference = "2"