Update node to 12.16.2

Author: witchent

Diff for: README.md

@@ -27,12 +27,12 @@ It's based on the official [Signal-Desktop](https://github.com/WhisperSystems/Si
 You need an iOS and Android phone with an existing Signal account that you are willing to link with the Signal client in this bridge.
 
 required software:
-- Node.js 10.13.0
+- Node.js 12.16.2
 - yarn
 
 Please verify if `yarn -v` outputs something like `1.17.3`. If your output is `ERROR: There are no scenarios; must have at least one.` you have installed cmdtests instead of yarn. Please [install yarn](https://yarnpkg.com/en/docs/install) before you continue.
 
-During the installation you will need Node.js version 10.13.0 because it's required in the `package.json` file of Signal-Desktop. After installing you can switch back to your preferred version of Node.js. The easiest way to change your version is using [n](https://www.npmjs.com/package/n). You can install it using `npm install -g n` and switch to Node.js 10.13.0 using `n 10.13.0`.
+During the installation you will need Node.js version 12.16.2 because it's required in the `package.json` file of Signal-Desktop. After installing you can switch back to your preferred version of Node.js. The easiest way to change your version is using [n](https://www.npmjs.com/package/n). You can install it using `npm install -g n` and switch to Node.js 12.16.2 using `n 12.16.2`.
 
 ## installation