php: require grpc extension to be installed before composer package
diff --git a/templates/composer.json.template b/templates/composer.json.template
index accfb38..3b4d62f 100644
--- a/templates/composer.json.template
+++ b/templates/composer.json.template
@@ -9,6 +9,7 @@
     "license": "BSD-3-Clause",
     "require": {
       "php": ">=5.5.0",
+      "ext-grpc": "*",
       "google/protobuf": "v3.1.0-alpha-1"
     },
     "require-dev": {