Upgrade to php-parser v3 (fixes #12).

Author: jmalloc

composer.json

@@ -6,8 +6,8 @@
         "php": "^7",
         "composer-plugin-api": "^1",
         "eloquent/enumeration": "^5",
-        "hamcrest/hamcrest-php": "^2.0",
-        "nikic/php-parser": "^2.1",
+        "hamcrest/hamcrest-php": "^2",
+        "nikic/php-parser": "^3",
         "recoil/api": "1.0.0-alpha.2"
     },
     "require-dev": {