Update fallible-iterator requirement from 0.2.0 to 0.3.0 (#7)

Updates the requirements on [fallible-iterator](https://github.com/sfackler/rust-fallible-iterator) to permit the latest version.
- [Release notes](https://github.com/sfackler/rust-fallible-iterator/releases)
- [Changelog](https://github.com/sfackler/rust-fallible-iterator/blob/master/CHANGELOG.md)
- [Commits](https://github.com/sfackler/rust-fallible-iterator/compare/v0.2.0...v0.3.0)

---
updated-dependencies:
- dependency-name: fallible-iterator
  dependency-type: direct:production
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Cargo.toml

@@ -16,7 +16,7 @@ exclude = ["**/tests/**", "**/examples/**", "**/benches/**", "**/target/**", "**
 [dependencies]
 mem_macros = "1.0.1"
 num-traits = "0.2.15"
-fallible-iterator = "0.2.0"
+fallible-iterator = "0.3.0"
 rosrust_msg = { version = "0.1", optional = true }
 rosrust = { version = "0.9", optional = true }