Update fallible-iterator requirement from 0.1 to 0.2

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](sfackler/rust-fallible-iterator@v0.1.0...v0.2.0)

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

Author: dependabot-support

unwind/Cargo.toml

@@ -6,7 +6,7 @@ authors = ["main() <[email protected]>"]
 [dependencies]
 gimli = "0.18"
 libc = "0.2"
-fallible-iterator = "0.1"
+fallible-iterator = "0.2"
 log = "0.4"
 
 [build-dependencies]