Update README.md

new options about deps and building

README.md

@@ -6,6 +6,8 @@ in-container integrating util to handle processes runtime
 
 ## Depends on
 - `rustup (>=1.27.1)`
+- `gcc-riscv64-unknown-elf`
+- `build-essential`
 
 ## Setting up
 Download and execute rustup.sh
@@ -32,13 +34,13 @@ curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
 3.1. Release build of app for amd64/linux
 
 ~~~bash  
-cargo build --release
+cargo x86_64
 ~~~
 
 3.2. Release build of app for riscv64/linux
 
 ~~~bash  
-cargo build --release --target riscv64gc-unknown-linux-gnu
+cargo riscv64
 ~~~