Update unicode-width requirement from 0.1 to 0.2

Updates the requirements on [unicode-width](https://github.com/unicode-rs/unicode-width) to permit the latest version.
- [Commits](https://github.com/unicode-rs/unicode-width/commits)

---
updated-dependencies:
- dependency-name: unicode-width
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Cargo.toml

@@ -20,7 +20,7 @@ portable-atomic = "1.0.0"
 rayon = { version = "1.1", optional = true }
 tokio = { version = "1", optional = true, features = ["io-util"] }
 unicode-segmentation = { version = "1", optional = true }
-unicode-width = { version = "0.1", optional = true }
+unicode-width = { version = "0.2", optional = true }
 vt100 = { version = "0.15.1", optional = true }
 
 [dev-dependencies]