Readme: update requirements

README.md

@@ -6,10 +6,11 @@ instance for getting metrics.
 ## Build from source (Linux)
 
 ### Prerequirements
-1. [Install cargo](https://doc.rust-lang.org/cargo/getting-started/installation.html)
-2. Install x86_64-unknown-linux-musl:  `rustup target add x86_64-unknown-linux-musl`
-3. musl-tools: `sudo apt install musl-tools`
-
+1. [Install cargo](https://doc.rust-lang.org/cargo/getting-started/installation.html) (required version: >=1.49)
+2. Install [node.js >=10.x](https://nodejs.org/en/download/)
+3. Install [yarn](https://classic.yarnpkg.com/lang/en/docs/install)
+4. Install x86_64-unknown-linux-musl:  `rustup target add x86_64-unknown-linux-musl`
+5. musl-tools: `sudo apt install musl-tools`
 
 ### Build
 ```