Update jni requirement from 0.19 to 0.20 (#24)

Updates the requirements on [jni](https://github.com/jni-rs/jni-rs) to permit the latest version.
- [Release notes](https://github.com/jni-rs/jni-rs/releases)
- [Changelog](https://github.com/jni-rs/jni-rs/blob/master/CHANGELOG.md)
- [Commits](https://github.com/jni-rs/jni-rs/compare/v0.19.0...v0.20.0)

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

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Cargo.toml

@@ -68,7 +68,7 @@ openssl = { version = "0.10", features = ["vendored"] } # Add for cross-compile.
 console-subscriber = { version = "0.1", optional = true } # only use in bin daemon.
 
 [target.'cfg(target_os="android")'.dependencies]
-jni = { version = "0.19", default-features = false }
+jni = { version = "0.20", default-features = false }
 
 # DEBUG patch.
 [patch.crates-io]