CollecTor does not know about Serge

Descriptor tarballs are now synced to colchicifolium.

2018-07-13 22:09:00,408 WARN o.t.c.b.BridgeSnapshotReader:125 Did not recognize the bridge authority that generated from-serge-2018-07-13T093706Z.tar.gz.  Skipping.

The following is required to make it go:

diff --git a/src/main/java/org/torproject/metrics/collector/bridgedescs/BridgeSnapshotReader.java b/src/main/java/org/torproject/metrics/collector/bridgedescs/BridgeSnapshotReader.java
index 1a58d84..85c593d 100644
--- a/src/main/java/org/torproject/metrics/collector/bridgedescs/BridgeSnapshotReader.java
+++ b/src/main/java/org/torproject/metrics/collector/bridgedescs/BridgeSnapshotReader.java
@@ -121,6 +121,10 @@ public class BridgeSnapshotReader {
                   authorityFingerprint =
                       "1D8F3A91C37C5D1C4C19B1AD1D0CFBE8BF72D8E1";
                   break;
+                case "from-serge-":
+                  authorityFingerprint =
+                      "BA44A889E64B93FAA2B114E02C2A279A8555C533";
+                  break;
                 default:
                   logger.warn("Did not recognize the bridge authority that "
                       + "generated " + fn + ".  Skipping.");