Update DEVELOPMENT.md build requirements

Fixes #265

Author: JetpackDuba

DEVELOPMENT.md

@@ -9,7 +9,10 @@
   please read [its documentation](https://www.rust-lang.org/). `cargo` and `rustc` must be available in the path in
   order to build Gitnuro properly.
 - **cargo-kotars:** A tool to run autogenerated bindings from Rust to Kotlin. You can install it using 
-  `cargo install cargo-kotars --git https://github.com/JetpackDuba/kotars`
+  `cargo install cargo-kotars --git https://github.com/JetpackDuba/kotars`.
+  NOTE: Make sure cargo-kotars is in your path, otherwise Gitnuro's build will fail.
+- **Enable Rust Nightly:** Kotars uses some nightly features to generate the binding for Gitnuro. Install nightly rust with
+  `rustup toolchain install nightly` and enable it as default with `rustup default nightly`.
 - **Perl:** Perl is required to build openssl (which is required for LibSSH to work).
 - **Packages for Linux ARM64/aarch64**: You need to install the `aarch64-linux-gnu-gcc` package to cross compile the
   Rust components to ARM from x86_64. You will also need to use `rustup` to add a new