Use the latest stable j4rs.

Author: astonbitecode

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"