Update rust-ini requirement from 0.19.0 to 0.20.0

Updates the requirements on [rust-ini](https://github.com/zonyitoo/rust-ini) to permit the latest version.
- [Release notes](https://github.com/zonyitoo/rust-ini/releases)
- [Commits](zonyitoo/rust-ini@v0.19.0...v0.20.0)

---
updated-dependencies:
- dependency-name: rust-ini
  dependency-type: direct:production
...

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

Cargo.toml

@@ -23,7 +23,7 @@ esplugin = "4.1.0"
 regex = "1.0.0"
 unicase = "2.0.0"
 rayon = "1.0.0"
-rust-ini = { version = "0.19.0", features = ["case-insensitive"] }
+rust-ini = { version = "0.20.0", features = ["case-insensitive"] }
 keyvalues-parser = "0.1.0"
 
 [target.'cfg(windows)'.dependencies]