tailcfg: bump capver for clients to talk Noise over any HTTPS port [capver 39]
// 36: 2022-08-02: added PeersChangedPatch.{Key,DiscoKey,Online,LastSeen,KeyExpiry,Capabilities}
// 37: 2022-08-09: added Debug.{SetForceBackgroundSTUN,SetRandomizeClientPort}; Debug are sticky
// 38: 2022-08-11: added PingRequest.URLIsNoise
-const CurrentCapabilityVersion CapabilityVersion = 38
+// 39: 2022-08-15: clients can talk Noise over arbitrary HTTPS port
+const CurrentCapabilityVersion CapabilityVersion = 39
type StableID string
