new: usr: add mineseeker game to the symfony 4 project #3

composer.json

@@ -4,6 +4,7 @@
     "require": {
         "php": "^7.3",
         "ext-iconv": "*",
+        "ext-json": "*",
         "doctrine/doctrine-migrations-bundle": "^2.0",
         "doctrine/orm": "^2.6",
         "gos/web-socket-bundle": "^1.8",
@@ -19,7 +20,7 @@
         "symfony/orm-pack": "^1.0",
         "symfony/polyfill-apcu": "^1.0",
         "symfony/twig-bundle": "^4.0",
-        "symfony/webpack-encore-bundle": "^1.0",
+        "symfony/webpack-encore-bundle": "^1.7",
         "symfony/yaml": "^4.0"
     },
     "require-dev": {