root(composer.json): fix ext-json version.

narekhovhannisyan · narekhovhannisyan · commit ddf0897db94f · 2019-01-15T18:13:59.000+04:00
diff --git a/composer.json b/composer.json
@@ -26,7 +26,7 @@
   "require": {
     "php": ">=7.1",
     "guzzlehttp/guzzle": "6.3.3",
-    "ext-json": ""
+    "ext-json": "*"
   },
  "autoload": {
    "psr-4": {
