add file to build.yaml
diff --git a/build.yaml b/build.yaml
index 5754583..7424a60 100644
--- a/build.yaml
+++ b/build.yaml
@@ -3353,6 +3353,7 @@
   - src/php/ext/grpc/channel.h
   - src/php/ext/grpc/channel_credentials.h
   - src/php/ext/grpc/completion_queue.h
+  - src/php/ext/grpc/php7_wrapper.h
   - src/php/ext/grpc/php_grpc.h
   - src/php/ext/grpc/server.h
   - src/php/ext/grpc/server_credentials.h