Merge pull request #1269 from libp2p/reservation-required

require the expiration field of the circuit v2 Reservation protobuf

Author: marten-seemann

p2p/protocol/circuitv2/pb/circuit.pb.go

@@ -38,7 +38,7 @@ message Peer {
 }
 
 message Reservation {
-  optional uint64 expire = 1; // Unix expiration time (UTC)
+  required uint64 expire = 1; // Unix expiration time (UTC)
   repeated bytes addrs = 2;   // relay addrs for reserving peer
   optional bytes voucher = 3; // reservation voucher
 }