fix: use buf

buf.yaml

@@ -0,0 +1,7 @@
+version: v1
+lint:
+  use:
+    - DEFAULT
+breaking:
+  use:
+    - FILE

licensing/users/v1/service.proto

@@ -10,15 +10,13 @@ package licensing.users.v1;
 
 option go_package = "code.pitz.tech/licensing/api-go/users/v1;usersv1";
 
-import "google/protobuf/empty.proto";
-
 message SignupRequest {}
 message SignupResponse {}
 
+message CurrentRequest {}
 message CurrentResponse {}
 
 service UserService {
   rpc Signup(SignupRequest) returns (SignupResponse);
-
-  rpc Current(google.protobuf.Empty) returns (CurrentResponse);
+  rpc Current(CurrentRequest) returns (CurrentResponse);
 }