Corrected license in composer.json

Author: Svish

composer.json

@@ -1,8 +1,8 @@
 {
     "name": "geekality/php-cross-domain-proxy",
     "description": "Simple self-contained PHP proxy for cross-origin ajax requests.",
-    "keywords": ["php-cross-domain-proxy","cross-domain", "http", "proxy", "javascript", "ajax"],
-    "license": "MIT",
+    "keywords": ["php-cross-domain-proxy", "cors", "cross-domain", "http", "proxy", "javascript", "ajax"],
+    "license": "GPL-3.0",
     "support": {
         "docs": "https://github.com/Svish/php-cross-domain-proxy/blob/master/README.md",
         "issues": "https://github.com/Svish/php-cross-domain-proxy/issues",