Update itertools requirement from 0.10 to 0.11

Updates the requirements on [itertools](https://github.com/rust-itertools/itertools) to permit the latest version.
- [Changelog](https://github.com/rust-itertools/itertools/blob/master/CHANGELOG.md)
- [Commits](rust-itertools/itertools@v0.10.0...v0.11.0)

---
updated-dependencies:
- dependency-name: itertools
  dependency-type: direct:production
...

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

derive/Cargo.toml

@@ -18,7 +18,7 @@ proc-macro = true
 syn = "1.0"
 proc-macro2 = "1.0"
 quote = "1.0"
-itertools = "0.10"
+itertools = "0.11"
 frunk_proc_macro_helpers = "0.1"
 
 [dev-dependencies]