treewide: Fix FIELD_LOWER_SNAKE_CASE rule exception

Change-Id: If59edf4c5483416c9779c382a5aafa58c7f73385
Reviewed-on: https://review.monogon.dev/c/monogon/+/3802
Reviewed-by: Leopold Schabel <leo@monogon.tech>
Tested-by: Jenkins CI
diff --git a/metropolis/proto/common/common.proto b/metropolis/proto/common/common.proto
index 4580ef2..e7b1b96 100644
--- a/metropolis/proto/common/common.proto
+++ b/metropolis/proto/common/common.proto
@@ -54,8 +54,8 @@
         // watcher and curator.Watch.
         bytes initial_crl = 3;
         message Peer {
-            string Name = 1;
-            string URL = 2;
+            string name = 1;
+            string url = 2;
         }
         repeated Peer peers = 4;
     }