Update protos to reflect link previews.

Scripts/ProtoWrappers.py

@@ -356,6 +356,10 @@ class MessageField:
             # TODO: I'm not sure why "Apple Swift Proto" code formats the
             # the name in this way.
             name = 'hasID'
+        elif name == 'hasUrl':
+            # TODO: I'm not sure why "Apple Swift Proto" code formats the
+            # the name in this way.
+            name = 'hasURL'
         return name
         
 class MessageContext(BaseContext):

SignalServiceKit/src/Protos/Generated/SSKProto.swift

@@ -2763,7 +2763,7 @@ extension SSKProtoDataMessageContact.SSKProtoDataMessageContactBuilder {
     }
 
     fileprivate class func parseProto(_ proto: SignalServiceProtos_DataMessage.Preview) throws -> SSKProtoDataMessagePreview {
-        guard proto.hasUrl else {
+        guard proto.hasURL else {
             throw SSKProtoError.invalidProtobuf(description: "\(logTag) missing required field: url")
         }
         let url = proto.url