[composer] add support section.

fixes php-enqueue/enqueue-dev#288

Author: makasim

composer.json

@@ -17,6 +17,13 @@
         "symfony/dependency-injection": "^2.8|^3|^4",
         "symfony/config": "^2.8|^3|^4"
     },
+    "support": {
+        "email": "[email protected]",
+        "issues": "https://github.com/php-enqueue/enqueue-dev/issues",
+        "forum": "https://gitter.im/php-enqueue/Lobby",
+        "source": "https://github.com/php-enqueue/enqueue-dev",
+        "docs": "https://github.com/php-enqueue/enqueue-dev/blob/master/docs/index.md"
+    },
     "autoload": {
         "psr-4": { "Enqueue\\Null\\": "" },
         "exclude-from-classmap": [