Use the latest stable j4rs.

astonbitecode · astonbitecode · commit 1931586e16ff · 2019-08-12T12:59:19.000+03:00
diff --git a/rust/Cargo.toml b/rust/Cargo.toml
@@ -10,7 +10,7 @@ crate-type = ["cdylib"]
 
 [dependencies]
 rust_keylock = {git="https://github.com/rust-keylock/rust-keylock-lib.git"}
-j4rs = {git="https://github.com/astonbitecode/j4rs.git"}
+j4rs = "0.8"
 libc = "0.2"
 jni-sys = "0.3"
 serde = "1.0"
