Modify the dependency to change the minimum allowed php-parser

Author: Hectorhammett

BigQuery/composer.json

@@ -16,7 +16,8 @@
         "phpdocumentor/reflection-docblock": "^5.3",
         "erusev/parsedown": "^1.6",
         "google/cloud-storage": "^1.3",
-        "google/cloud-bigquery-reservation": "^2.0"
+        "google/cloud-bigquery-reservation": "^2.0",
+        "nikic/php-parser": "^5.0"
     },
     "suggest": {
         "google/cloud-storage": "Makes it easier to load data from Cloud Storage into BigQuery"