build(package.json): Add a valid publisher name

Author: h4kst3r

package.json

@@ -2,7 +2,7 @@
     "name": "php-awesome-snippets",
     "displayName": "PHP Awesome Snippets",
     "version": "0.1.0",
-    "publisher": "HakCorp",
+    "publisher": "hakcorp",
     "description": "A fullset of snippets for PHP devs to boost coding productivity.",
     "author": {
         "name": "JH Ster"