Update getrandom requirement from 0.1 to 0.2

Updates the requirements on [getrandom](https://github.com/rust-random/getrandom) to permit the latest version.
- [Release notes](https://github.com/rust-random/getrandom/releases)
- [Changelog](https://github.com/rust-random/getrandom/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rust-random/getrandom/compare/v0.1.0...v0.2.0)

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

lib/Cargo.toml

@@ -47,7 +47,7 @@ native-tls = { version = "0.2", optional = true }
 
 [target.'cfg(target_arch = "wasm32")'.dependencies]
 js-sys = "0.3"
-getrandom = {version="0.1", features=["wasm-bindgen"]}
+getrandom = {version="0.2", features=["wasm-bindgen"]}
 
 [dev-dependencies]
 rayon = "1"