compatibility for recent tree-sitter versions

[dan0v]

I need compatibility with recent tree-sitter versions, so I have updated the bindings to match those in tree-sitter-java. Rust bindings work as expected. I have not tested support for other languages.

Should address #161 and #159

[dan0v]

For anyone who needs the bindings updated right now and can't wait for it to be merged, you can just add this to your Cargo.toml:

[dependencies]
tree-sitter-kotlin     = { git = "https://github.com/dan0v/tree-sitter-kotlin.git" }

or to pin the exact version by commit hash:

[dependencies]
tree-sitter-kotlin     = { git = "https://github.com/dan0v/tree-sitter-kotlin.git", rev = "8cf939e62c048e3366e3c1b0796090f939b4feba" }

[wetneb]

There is also https://crates.io/crates/tree-sitter-kotlin-ng, which is compatible with more recent tree-sitter versions.