Merge pull request #155 from c960657/composer-require

Declare PHP extension requirements

Author: vtsao

composer.json

@@ -2,7 +2,10 @@
     "name": "googleads/googleads-php-lib",
     "description": "Google Ads APIs Client Library for PHP (AdWords and DFP)",
     "require": {
-        "php": ">=5.3.0"
+        "php": ">=5.3.0",
+        "ext-curl": "*",
+        "ext-openssl": "*",
+        "ext-soap": "*"
     },
     "type": "library",
     "homepage": "https://github.com/googleads/googleads-php-lib",