Use legacy-peer-deps npm install for react native (#317)

Fixes debug builds on Windows

Author: bghgary

Apps/Playground/package-lock.json

@@ -11,7 +11,7 @@ function postInstall() {
   const version = shelljs.exec('npm --version', {silent: true});
 
   console.log(chalk.black.bgCyan('Installing Babylon React Native npm packages...'));
-  shelljs.exec('npm install', {cwd: '../../Modules/@babylonjs/react-native'});
+  shelljs.exec('npm install --legacy-peer-deps', {cwd: '../../Modules/@babylonjs/react-native'});
 
   console.log(chalk.black.bgCyan('Updating submodules...'));
   shelljs.exec('git submodule update --init --recursive', {cwd: '../../'});